Glass composite, casing, display device and terminal device

ABSTRACT

A glass composite includes a first glass member and a second glass member. The first glass member and the second glass member are at least partially connected with each other at the surfaces, and a contact interface is formed on the contacting position of the first glass member and the second glass member. The contact interface is visually observed to have no crevices; and when the glass composite is in contact with an acid solution, crevices are suitably formed in the glass composite at the contact interface.

CROSS-REFERENCE TO RELATED APPLICATIONS

Present disclosure claims priority to Chinese Patent Application No201810873440.6 filed by the BYD Co., Ltd. on Aug. 2, 2018, and entitledGLASS COMPOSITE, HOUSING, DISPLAY APPARATUS, AND TERMINAL DEVICE.

FIELD

The present disclosure relates to the technical field of electronicdevices, and in particular, to a glass composite, a casing, a displaydevice, and a terminal device.

BACKGROUND

Glass, due to its brittleness, is difficult to be processed,particularly when being processed into some complex and fine shapes andstructures. At present, in order to expand the scope of application ofglass and meet the requirements of use in some specific fields, multipleglass members can be compounded to form a glass composite for use. Assuch, the obtained composite has the properties of glass and can attaincomplex and fine shapes. However, the glass composite currently obtainedhas the problem of unsatisfactory bonding strength that cannot meet therequirement during use, or the problem of deformation of glass duringprocessing, which greatly affects the appearance quality and opticalperformance of the glass composite. Moreover, uneven deformation cancause serious surface distortion and unevenness, which limits the use ofglass composite.

Accordingly, glass composite-related technologies still needimprovement.

SUMMARY

The present disclosure aims to solve one of the technical problems inrelated art at least to some extent. In this regard, an objective ofpresent disclosure is to provide a glass composite with desired bondingstrength, high light transmittance, good optical performance, almost nobubbles or fantasy colors, relatively flat surface, almost no scratches,better performance during use, simple preparation and low cost.

One aspect of the present disclosure provides a glass composite.According to an embodiment of the present disclosure, the glasscomposite includes a first glass member and a second glass member. Thefirst glass member and the second glass member are at least partiallyconnected with each other at the surfaces, a contact interface is formedon the contacting position of the first glass member with the secondglass member. The contact interface is visually observed to have novisible crevices, and when the glass composite is in contact with anacid solution, crevices are suitably formed in the glass composite atthe contact surface.

The glass composite can be formed at a low temperature, the preparationconditions are mild and easy to implement, and the preparation cost islow. The glass composite has a good compounding effect, and has abonding strength, an appearance and an optical performance suitable foruse in electronic devices. By using the glass composite, a complex andfine special-shaped structure can be attained. In addition, the rate atwhich the contact surface is corroded by an acid solution is faster thanthe rate at which the first glass member and the second glass member arecorroded by hydrofluoric acid. By means of this, the bonding interface(that is, the existence of contact interface) can be effectivelydetected.

Another aspect of the present disclosure provides a casing. According toan embodiment of the present disclosure, at least a part of the casingis formed by the glass composite described above. As such, the bondingstrength between the first glass member and the second glass member inthe casing can meet the requirements of use of a casing in theelectronic devices. The casing is ensured to have excellent structurestability, high light transmittance, good optical performance, andalmost no bubbles or fantasy colors, can attain a special-shapedstructure, meet the requirements of use in different situations, andhave a wide scope of application and a low cost.

Another aspect of present disclosure provides a display device.According to an embodiment of the present disclosure, the display deviceincludes the glass composite or the casing described above. Therefore,the display device has suitable strength, aesthetic appearance, highlight transmittance, and good display effect.

Further aspect of present disclosure provides a terminal device.According to an embodiment of the present disclosure, the terminaldevice includes the glass composite, the casing or the display devicedescribed above. The present inventors find that the terminal device isaesthetically pleasant, has high strength, can achieve an all-glassappearance, and has good performance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional structural view of a glasscomposite according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional structural view taken along theline B-B′ in

FIG. 1;

FIG. 3 is a schematic cross-sectional structural view taken along theline C-C′ in

FIG. 2;

FIG. 4A is a top view of a casing according to an embodiment of thepresent disclosure;

FIG. 4B is a top view of the casing according to another embodiment ofthe present disclosure;

FIG. 4C is a top view of the casing according to another embodiment ofthe present disclosure;

FIGS. 5A and 5B are schematic cross-sectional structural views takenalong the line A-A′ in FIG. 4A, along the line D-D′ in FIG. 4B, or alongthe line E-E′ in FIG. 4C;

FIG. 6 is a schematic cross-sectional structural view of the casingaccording to another embodiment of the present disclosure;

FIG. 7 is a schematic planar structural view of the casing according toanother embodiment of the present disclosure;

FIG. 8 is a schematic cross-sectional structural view taken along theline D-D′ in FIG. 7;

FIG. 9 illustrates schematic planar structural views of a firstframe-shaped glass member and a second frame-shaped glass memberaccording to an embodiment of the present disclosure;

FIG. 10 is a schematic structural view of the casing according toanother embodiment of the present disclosure, where the upper panel is aschematic planar structural view, and the lower panel is a schematiccross-sectional structural view along the line E-E′ in the upper panel;

FIG. 11 is a schematic structural view of the casing according toanother embodiment of the present disclosure, where the upper panel is aschematic planar structural view, and the lower panel is a schematiccross-sectional structural view along the line F-F′ in the upper panel;

FIG. 12 is a schematic planar structural view of the casing according toanother embodiment of the present disclosure;

FIG. 13 is a schematic flow chart of a method for producing the glasscomposite according to an embodiment of the present disclosure;

FIG. 14 is a schematic flow chart of the method for producing the glasscomposite according to another embodiment of the present disclosure;

FIG. 15 is a schematic cross-sectional structural view of the casingaccording to another embodiment of the present disclosure;

FIG. 16 is a schematic view of a test method for bonding force inCompounding Example 1 of the present disclosure;

FIG. 17 is a photo showing the casing according to an embodiment of thepresent disclosure;

FIG. 18 is a photo showing a cross section of a cut glass compositeaccording to an embodiment of the present disclosure;

FIG. 19 is a photo showing the casing in Comparative Example 1; and

FIG. 20 is a photo showing the cross section of the cut glass compositein Comparative Example 1.

DETAILED DESCRIPTION

Embodiments of the present disclosure will be described in detail below.The embodiments described below are exemplary, and are only intended toexplain the present disclosure rather than being construed as limitationto the present disclosure. Where specific techniques or conditions arenot indicated in the examples, the procedures shall be carried out inaccordance with the techniques or conditions described in theliteratures in the field or in accordance with the productspecification. The reagents or instruments for which no manufacturersare noted are all common products commercially available from themarket.

In one aspect of present disclosure, a glass composite is provided.According to an embodiment of the present disclosure, referring to FIG.1, the glass composite includes a first glass member 1 and a secondglass member 2 which are at least partially connected with each other atthe surfaces, where the position of contact of the first glass member 1with the second glass member 2 defines a contact interface that isvisually observed to have no crevices. When the glass composite is incontact with an acid solution, crevices are suitably formed in the glasscomposite at the contact surface. The glass composite can be formed at alow temperature, the preparation conditions are mild and easy toimplement, and the preparation cost is low. The glass composite has agood compounding effect, and has a bonding strength, an appearance, andan optical performance suitable for use in electronic devices. By usingthe glass composite, a complex and fine special-shaped structure can beattained. In addition, the rate at which the contact surface is corrodedby an acid solution is faster than the rate at which the first glassmember and the second glass member are corroded by hydrofluoric acid. Bymeans of this, the bonding interface (that is, the existence of contactinterface) can be effectively detected.

According to some embodiments of the present disclosure, the glasscomposite is visually observed to have no crevices at the contactinterface under 100× magnification. According to some embodiments of thepresent disclosure, the glass composite is visually observed to have nocrevices at the contact interface under 300× magnification. According tosome embodiments of the present disclosure, the glass composite isvisually observed to have no crevices at the contact interface under500× magnification. According to some specific embodiments of thepresent disclosure, no crevices are visually observed under 500×magnification or less, such as 10×, 50×, 100×, 150×, 200×, 300×, 350×,400×, 450× or even 500×, indicating that the bonding strength betweenthe first glass member and the second glass member is high. The glassmember does not suffer obvious deformation during the bonding process,the inner unity of the glass composite is good, and the performanceduring use is good. It should be noted that the visually visible crevicerefers to a crevice with the minimum size that can be distinguished bynaked eyes. Generally, the minimum size that can be distinguished bynaked eyes is 0.01 mm, and the visually visible crevice in presentdisclosure refers to a crevice that is not less than 0.01 mm in width.

According to an embodiment of the prevent disclosure, the acid solutionis a solution that can corrode glass. In some embodiments of the presentdisclosure, the acid solution may be a hydrofluoric acid solution with amass concentration of 5-40%. Therefore, the corrosion rate isappropriate and the performance during use is better.

According to an embodiment of the prevent disclosure, when the glasscomposite is brought into contact with a hydrofluoric acid solutionhaving a mass concentration of 5-40% for 30 s to 20 min (for example 30s, 1 min, 5 min, 10 min, 15 min, and 20 min), the contact interface iscorroded to form a crevice having a width of 0.1-300 μm, for example 0.1μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm,55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, 100 μm,105 μm, 110 μm, 115 μm, 120 μm, 125 μm, 130 μm, 135 μm, 140 μm, 145 μm,150 μm, 155 μm, 160 μm, 165 μm, 170 μm, 175 μm, 180 μm, 185 μm, 190 μm,195 μm, 200 μm, 205 μm, 210 μm, 215 μm, 220 μm, 225 μm, 230 μm, 235 μm,240 μm, 245 μm, 250 μm, 255 μm, 260 μm, 265 μm, 270 μm, 275 μm, 280 μm,285 μm, 290 μm, 295 μm, and 300 μm.

In some specific embodiments of the prevent disclosure, after the firstcross section described herein is brought into contact with hydrofluoricacid having a mass concentration of 5%, 10%, 20% and 40% for 300 srespectively, the width of the crevice is respectively 0.1-30 μm (forexample, 0.1 μm, 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, and 30 μm),0.5-50 μm (for example, 0.5 μm, 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm,30 μm, 35 μm, 40 μm, 45 μm, and 50 μm), 0.5-100 μm (for example, 0.5 μm,1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm, and100 μm), and 2-100 μm (for example, 2 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75μm, 80 μm, 85 μm, 90 μm, 95 μm, and 100 μm). After the first crosssection is brought into contact with hydrofluoric acid having a massconcentration of 5%, 10%, 20%, and 40% for 600 s respectively, the widthof the crevice is respectively 1-50 μm (for example, 1 μm, 5 μm, 10 μm,15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, and 50 μm), 1-80 μm(for example, 1 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, and 85 μm),3-120 μm (for example, 3 μm, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85μm, 90 μm, 95 μm, 100 μm, 105 μm, 110 μm, 115 μm, and 120 μm) and 5-120μm (for example, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm,45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95μm, 100 μm, 105 μm, 110 μm, 115 μm, and 120 μm).

It should be noted that in the embodiments of present disclosure, thewidth of the crevice given depends on the specific glass material,experimental conditions and test conditions used by the presentinventors, and the width varies with different glass materials,experimental conditions, or test conditions.

According to the embodiments of the present disclosure, the position ofcontact of the glass composite with the hydrofluoric acid solution isnot particularly limited, as long as the position of contact withhydrofluoric acid includes the contact interface of the first glassmember and the second glass member. In some embodiments of the preventdisclosure, referring to FIG. 2 and FIG. 3, a cross section cut alongthe direction perpendicular to the contact interface connecting thefirst glass member 1 and the second glass member 2 is defined as thefirst cross section (see FIG. 2 for the schematic structure, andspecifically, the first cross section is obtained after cutting theglass composite; for ease of observation, the first cross sectionobtained after cutting is polished to remove burrs, such that the effectin observation is much better). After the first cross section isvisually observed to have no crevices by naked eyes or at amagnification of 500×, and after being brought into contact with an acidsolution, a crevice 3 appears at the contact interface (see FIG. 3 forthe schematic structure, where the crevice shape shown in FIG. 3 ismerely illustrative, and should not be construed as limiting the presentdisclosure; and it can be understood by those skilled in the art thatthe specific crevice shape can be various geometric shapes or irregularrandom shapes depending on the etching process with hydrofluoric acid).Therefore, the glass composite has suitable bonding strength, appearanceand optical performance, is suitable for use in a casing of electronicdevices, has mild preparation conditions and low cost, and can beproduced at a large scale.

According to an embodiment of the present disclosure, the material ofthe first glass member or the second glass member includes, but is notlimited to, aluminosilicate (such as Corning glass, etc.), borosilicate(such as Schott glass, etc.), cover glass (including high-aluminahigh-alkali aluminosilicate glass and soda-lime silica glass, etc.),touch screen substrate glass (such as alkali and heavy metal (arsenic,antimony, and barium)-free alkaline earth sodiumpyroborate-aluminosilicate glass, soda glass and neutral borosilicateglass), and TFT display screen substrate glass (including but notlimited to Corning Eagle XG, Eagle XG Slim, Willow and other brands ofalkali and heavy metal (arsenic, antimony, and barium)-free alkalineearth sodium pyroborate-aluminosilicate glass). Flexible selections canbe made by those skilled in the art according to actual needs, as longas the requirements can be met.

According to an embodiment of the present disclosure, the specificstructure and shape of the glass composite are not particularly limited,and may be a sheet structure, various complex 2.5-dimensional structuresor 3-dimensional structures. As a result, the requirements of use indifferent situations can be met, thus expanding the scope of applicationof glass members.

According to an embodiment of the present disclosure, there are noparticular restrictions on the specific shape, and structure of theglass products, and flexible selections can be made by those skilled inthe art according to the requirements of actual products. For example,the glass product is a casing formed by compounding the first glassmember and the second glass member. In some embodiments of the presentdisclosure, the first glass member and the second glass member mayspecifically be of a 2D structure, a 2.5D structure or a 3D structure.The contact surfaces of the first glass member and the second glassmember can be a flat surface, a curved surface (see FIG. 6), or acombination of a flat surface and a curved surface, as long as the twocan be brought into contact with each other without clearance. Forexample, if the activated of the first glass member is an upwardlybulged curved surface, then the surface of the second glass member iscorrespondingly an upwardly depressed curved surface. The specific shapeand structure can be flexibly selected by those skilled in the artaccording to actual needs. Specifically, the first glass member and thesecond glass member can be each independently a sheet glass member, aframe-shaped glass member (that is, a closed ring-shaped glass member,for example, circular ring-shaped glass, rectangular ring-shaped glass,or ring-shaped glass with an outer peripheral edge having straight andcurved lines in combination), or a bar-like glass member (such as longbar, round bar, or irregular polygonal bar). In some specificembodiments, referring to FIGS. 4A (rectangular ring-shaped glass) and4B (circular ring-shaped glass), the first glass member is a sheet glassmember, and the second glass member is a frame-shaped glass member,where the frame-shaped glass member is compounded to the outerperipheral edge of the sheet glass member (see FIG. 5A) or theframe-shaped glass member is compounded to the outer peripheral face ofthe sheet glass member (see FIG. 5B). In some other specificembodiments, referring to FIG. 4C, the first glass member is a sheetglass member, and the second glass member is a bar-shaped glass member,where the bar-shaped glass member is compounded to the outer peripheraledge of the sheet glass member (where specifically, the bar-shaped glassmember can be compounded to the outer peripheral edge at one, two ormore sides; and see FIG. 5A for the schematic structure of the crosssection where the bar-shaped glass member is compounded to two opposingouter peripheral edges), or a frame-shaped glass member is compounded tothe outer peripheral face of the sheet glass member (where specifically,the frame-shaped glass member can be compounded to the outer peripheralface at one, two or more sides; and see FIG. 5B for the schematicstructure of the cross section where the frame-shaped glass member iscompounded to two opposing outer peripheral faces). Of course, theforegoing is only an exemplary description of the casing structure ofthe present disclosure, and cannot be understood as a limitation of thepresent disclosure.

According to other embodiments of the present disclosure, referring toFIG. 7, the first glass member in the glass composite is a first sheetglass member 11 and the second glass member is a second sheet glassmember 21. The shape of the second sheet glass member 21 includesrectangle, square, circle (see FIG. 7 for the schematic structure),polygons or irregular shapes. Specifically, the surfaces of the firstsheet glass member 11 and the second sheet glass member 21 may bepartially in contact, or part of the surface of the first sheet glassmember 11 is in contact with a whole surface of the second sheet glassmember 21 (see FIGS. 7 and 8 for the schematic structure). Of course, itis to be understood by those skilled in the art that in addition to thecases shown in FIGS. 6, 7 and 8, other shapes and modes of connectionare also contemplated in the scope of protection of the presentdisclosure.

According to an embodiment of the present disclosure, referring to FIGS.7 and 8, the surface with a larger area of the first sheet glass member11 is connected to the surface with a larger area of the second sheetglass member 21.

According to some embodiments of the present disclosure, referring toFIGS. 9-12, the first glass member in the glass composite is a firstframe-shaped glass member 12 and the second glass member is a secondframe-shaped glass member 22. Specifically, the shapes of the firstframe-shaped glass member and the second frame-shaped glass member arenot particularly limited. Referring to FIG. 12, they can be a circle, abox, a curved frame, or a frame having straight and curved lines incombination. The position of connection of the first frame-shaped glassmember and the second frame-shaped glass member is also not particularlylimited. They can be laminated and connected vertically (see FIGS. 10and 11 for the schematic structure), or connected horizontally side byside (see FIG. 12 for the schematic structure), and have an alignedarrangement (see FIG. 10 and the upper panel of FIG. 12 for theschematic structure), or staggered arrangement (see the lower panels ofFIGS. 11 and 12 for the schematic structure).

Of course, those skilled in the art can understand that the shape andstructure of the glass composite described above are only illustrativeand should not be construed as limiting the present disclosure. Thespecific shape and structure of the glass composite can be flexiblyselected according to the requirements in practical application.

According to an embodiment of the present disclosure, the glasscomposite has a light transmittance not lower than 95% of the lighttransmittance of the one, with the lower light transmittance, of thefirst glass member and the second glass member. For example, the glasscomposite has a light transmittance not lower than 95%, 96%, 97%, 98%,99%, or 100% of the light transmittance of the one, with the lower lighttransmittance, of the first glass member and the second glass member.Specifically, if the light transmittance of the first glass member isgreater than the light transmittance of the second glass member, thenthe light transmittance of the glass composite is not less than 95% ofthe light transmittance of the second glass member. If the lighttransmittance of the first glass member is lower than the lighttransmittance of the second glass member, then the light transmittanceof the glass composite is not less than 95% of the light transmittanceof the first glass member. Therefore, the glass composite has high lighttransmittance, good optical performance, and almost no bubbles orfantasy colors; and by means of the connection between the first glassmember and the second glass member, various complex and fine shapes andstructures can be attained, including, for example, but not limited to,a special-shaped structure and a six-sided-ring enveloped structure.

It should be noted that the light transmittance of a glass member isoften related to the thickness of the glass member. When the differencein thickness is not large and the thickness has no obvious influence onthe light transmittance, with reference to “the glass composite has alight transmittance not lower than 95% of the light transmittance of theone, with the lower light transmittance, of the first glass member andthe second glass member” as described herein, the influence of thicknesson the glass and the glass composite can be ignored. For example, thiscan be that the light transmittance at the bonding position of the firstglass member and the second glass member in the glass composite is notlower than 95% of the light transmittance of the one, with the lowerlight transmittance, of the first glass member and the second glassmember. If the thickness of the first glass member or the second glassmember is large and the thickness has an obvious influence on the lighttransmittance, “the glass composite has a light transmittance not lowerthan 95% of the light transmittance of the one, with the lower lighttransmittance, of the first glass member and the second glass member” asdescribed herein may be that the light transmittance at the bondingposition of the first glass member and the second glass member in theglass composite is not lower than 95% of the light transmittance of thesame glass member having the same or close thickness at the bondingposition and with the lower light transmittance, of the first glassmember and the second glass member.

According to an embodiment of the prevent disclosure, at least one ofthe first glass member and the second glass member is formed by aplurality of sub-glass members, and at least part of the surfaces of twoadjacent sub-glass members are connected. Therefore, a glass compositeformed by connecting three, four or more glass members can be achieved,which makes it easier to form complex and fine structures and shapes,thus expanding the scope of application of glass.

According to an embodiment of the prevent disclosure, the materialforming the sub-glass member may be the same as the material forming thefirst glass member or the second glass member described above, and thetwo adjacent sub-glass members are connected in the same mode as doesbetween the first glass member and the second glass member. That is,when the first glass member or the second glass member formed by aplurality of the sub-glass members is brought into contact with an acidsolution, crevices are suitably formed in the glass composite at thecontact interface of two sub-glass members. As a result, a complex andfine special-shaped structure is achieved. The light transmittance ofthe glass composite is substantially not affected, and the opticalperformance is better. It is applicable to an electronic device, andeven an all-glass appearance of an electronic device can be realizedtherewith.

According to an embodiment of the prevent disclosure, the number ofsub-glass members is not particularly limited, and can be flexiblyselected by those skilled in the art according to actual needs as longas the requirements can be met.

According to an embodiment of the prevent disclosure, in order tofurther improve the light transmittance of the glass composite to meetthe requirements of use in the display field (such as the displayscreen), at least one surface of the first glass member or the secondglass member can be provided with an anti-reflection (AR) film, tofurther improve the light transmittance of the glass composite andenable the glass composite to achieve a light transmittance comparableto or higher than that of the first glass member or the second glassmember.

According to an embodiment of the prevent disclosure, the glasscomposite can be used in a protective cover plate or casing for anelectronic product, as well as in a casing of a wearable device or inautomotive glass.

According to an embodiment of the prevent disclosure, referring to FIG.13, the glass composite can be prepared through a process comprising thefollowing steps:

S100: Activate at least a part of the surface of the first glass memberand at least a part of the surface of the second glass member,respectively, to form an activated surface.

According to an embodiment of the prevent disclosure, referring to FIG.14, the method further includes before the activation treatment:

S110: Clean the surface to be activated of the first glass member andthe surface to be activated of the second glass member. In someembodiments of the prevent disclosure, the cleaning may include: washingthe glass member with an acid detergent (such as hydrofluoric acid,sulfuric acid or peroxyacetic acid), an alkaline detergent (such assodium carbonate or calcium hypochlorite), or an organic reagent (suchas acetone, or), and drying. In some embodiments of the preventdisclosure, the glass member can be washed with trichloroethylene. Thisis beneficial to remove the oil stain on the surfaces of the glassmembers, to facilitate the progression of subsequent steps.

According to an embodiment of the prevent disclosure, the activation cansuitably produce unsaturated chemical bonds on the surface of the firstglass member and the surface of the second glass member. Therefore,after the activation, unsaturated chemical bonds with higher energy aregenerated on the surface of the first glass member or the second glassmember, so when the two are infinitely close to each other, theunsaturated chemical bonds on the surfaces of the glass members arebonded to each other to form a stable saturated chemical bond. The innerunity of the glass composite obtained is high, and the bonding forcebetween the first glass member and the second glass member is strong,whereby the final glass composite has an almost unaffected lighttransmittance and good performance.

It should be noted that the phrase “unsaturated chemical bond” usedherein refers to a chemical bond that contains an unpaired electron orlone pair of electrons, generally has a high energy and cannot existstably. For example, it can be a metal atom linked with an oxygen atomhaving a lone pair of electrons contained in the glass member, where themetal atom can specifically be any metal atom contained in the glass,including, for example, but not limited to aluminum-oxygen unsaturatedbond, sodium-oxygen unsaturated bond, potassium-oxygen unsaturated bond,and calcium-oxygen unsaturated bond. It can also be a non-metallic atomlinked with an oxygen atom having a lone pair of electrons in the glassmember, where the non-metallic atom can specifically be any non-metallicatom in the glass member, including, for example, but not limited to,silicon-oxygen unsaturated bond, and boron-oxygen unsaturated bond. Itcan also be a metal atom or non-metal atom having an unpaired electronor empty orbital (easy to bond with a lone pair of electrons), forexample, aluminum, sodium, potassium, or calcium that contains anunpaired electron or has an empty orbital; or it can also be a silicondangling bond, or an oxygen dangling bond. “Saturated chemical bond”refers to a chemical bond that does not contain an unpaired electron,generally has a low energy, and can exist stably. Specifically, it canbe a chemical bond formed after the above-mentioned unsaturated bond isbonded, including, but not limited to, silicon-oxygen-silicon bond andthe like. According to an embodiment of the prevent disclosure, theactivation includes at least one of the following methods: a. making atreatment with an activation solution, wherein the activation solutionis acid or alkaline; b. making a treatment with a plasma; and c. makinga treatment with a UV. For example, it is possible to adopt treatmentwith an activation solution, plasma treatment or UV treatment alone,treatment with an activation solution and plasma treatment incombination, plasma treatment and UV treatment in combination, treatmentwith an activation solution and UV treatment in combination, ortreatment with an activation solution, plasma treatment and UV treatmentin combination. Therefore, the operation is simple, convenient, and easyto implement, an activated surface can be efficiently formed on thesurfaces of the first glass member and the second glass member, theactivation effect is better, and the bonding force between the firstglass member and the second glass member can be significantly improved.

According to an embodiment of the prevent disclosure, when the treatmentwith an activation solution is employed, the specific method ofactivation includes, but is not limited to, dropping the activationsolution onto the surfaces to be activated of the first glass member andthe second glass member, or immersing the first glass member and thesecond glass member in the activation solution. When the plasmatreatment is employed, the first glass member and the second glassmember are positioned in a plasma treatment device, and then thesurfaces of the first glass member and the second glass member areactivated by plasma generated by an inert gas (for example, one ofnitrogen, argon, and helium, or a mixture thereof), ahydrogen-containing gas or an oxygen-containing gas under the action ofelectrical discharge, high-frequency electromagnetic oscillation, shockwave, and high-energy radiation. When the UV treatment is employed, thefirst glass member and second glass member can be directly irradiatedwith ultraviolet light, or the first glass member and the second glassmember can be irradiated with ultraviolet light in the presence ofozone, whereby ozone can provide highly active atomic oxygen to form avolatile substance with free radicals generated after the dissociationof the dirt and thus enable an activated surface.

According to an embodiment of the prevent disclosure, the activationsolution contains: an acid (including, for example, but not limited to,at least one of sulfuric acid, hydrochloric acid, hydrogen fluoride,ammonium bifluoride, nitric acid, and acetic acid) or a alkali(including, for example, but not limited to, at least one of sodiumcarbonate, sodium bicarbonate, potassium hydroxide, sodium hydroxide andaqueous ammonia); and an auxiliary agent, including at least one of anoxidizing agent (for example, at least one of potassium dichromate,hydrofluoric acid, hydrochloric acid and hydrogen peroxide), an alcohol(including, for example, but not limited to, ethanol and methanol), anorganic acid (including, for example, but not limited to, acetic acid),a carbohydrate (including, for example, but not limited to, glucose), anamino acid, and a surfactant (including, for example, but not limitedto, sodium dodecyl sulfonate). Therefore, the activation solution cancreate a better acid or alkaline environment, with which unsaturatedchemical bonds with higher energy can be formed on the surfaces of theglass members, which is beneficial to the subsequent steps.

According to an embodiment of the prevent disclosure, the activationsolution is acid or alkaline. Therefore, the activation operation issimple and convenient, and can be accomplished easily, and theactivation effect is better. According to an embodiment of the preventdisclosure, when the activation solution is acid, the activationsolution further includes an oxidizing agent (such as potassiumdichromate, potassium permanganate, nitric acid, and hydrogen peroxide,etc.), to improve the activation ability of the activation solution, soas to form unsaturated chemical bonds on the surface of the glass membereasily.

According to an embodiment of the prevent disclosure, the pH of theactivation solution is not greater than 4 (such as 1, 2.5, 3, 3.5, and4, etc.), or the pH of the activation solution is 10-14 (such as 10,10.5, 11, 11.5, 12, 12.5, 13, 13.5, and 14 etc.). When the pH of theactivation solution is within the above range, more unsaturated chemicalbonds can be formed, which is beneficial to the compounding between thefirst glass member and the second glass member. If the activationsolution is excessively highly acid or alkaline, the surface roughnessof the glass member is affected, making the light transmittance of theglass composite relatively low; and if the activation solution isexcessively lowly acid or alkaline, the activation effect on the surfaceof the glass member is poor, and few unsaturated chemical bonds areobtained.

In some embodiments of the prevent disclosure, the raw materials forforming the activation solution include hydrogen peroxide and sulfuricacid. In this manner, the activation effect of the activation solutionis better, and more unsaturated chemical bonds are obtained, which ismore conducive to the compounding between the first glass member and thesecond glass member; and the glass composite thus obtained has almost nobubbles or fantasy colors. In some specific embodiments of the preventdisclosure, the activation solution is a mixture of hydrogen peroxideand sulfuric acid in a volume ratio of (1:3) to (3:7) (such as 1:3,1:2.8, 1:2.6, 1:2.5, and 1:2.3). As such, the activation solution isrelatively highly acid or oxidative, which promotes the activation ofthe surface of the glass member to generate more unsaturated chemicalbonds, so a better activation effect is achieved. Compared with otherranges of mixing ratio, when the volume ratio of hydrogen peroxide andsulfuric acid is within the above range, the activation effect isbetter, the light transmittance of the obtained glass composite ishigher, and the fantasy color is less.

In some other embodiments of the present disclosure, the raw materialsfor forming the activation solution include potassium dichromate andsulfuric acid, including, for example, but not limited to, a mixture ofpotassium dichromate and sulfuric acid in a weight ratio of (1-3):4(such as 1:4, 1.5:4, 2:4, 2.5:4, and 3:4). In some embodiments of thepresent disclosure, the raw materials for forming the activationsolution include hydrofluoric acid and ammonium bifluoride, for example,a mixed solution of hydrofluoric acid and ammonium bifluoride having amass concentration of 5%-40% (such as 5%, 10%, 15%, 20, 25%, 30%, 35%,and 40%). As a result, the surface activation of the glass member ispromoted to generate more unsaturated chemical bonds, and the activationeffect is better.

In some embodiments of the prevent disclosure, the raw materials forforming the activation solution include aqueous ammonia and hydrogenperoxide. In some specific embodiments of the prevent disclosure, theactivation solution is a mixed solution of aqueous ammonia and hydrogenperoxide in a volume ratio of (1:1)-(1:5) (for example, 1:1, 1:2, 1:3,1:4, and 1:5). As such, the activation solution is relatively highlyoxidative, which promotes the activation of the surface of the glassmember to generate more unsaturated chemical bonds, so a betteractivation effect is achieved.

According to an embodiment of the prevent disclosure, the raw materialsfor forming the alkaline activation solution include sodium hypochloriteand aqueous ammonia. In some embodiments of the prevent disclosure, thealkaline activation solution includes a mixture of 5-20 wt % of sodiumhypochlorite, 5-30 wt % of aqueous ammonia, and 50-90 wt % of deionizedwater, in which the content of sodium hypochlorite can be 5 wt %, 10 wt%, 15 wt % or 20 wt %, the content of aqueous ammonia can be 5 wt %, 10wt %, 15 wt %, 20 wt %, 25 wt % or 30 wt %, and the content of deionizedwater can be 50 wt %, 55 wt %, 60 wt %, 65 wt %, 70 wt %, 75 wt %, 80 wt% or 90 wt %. As a result, the activation solution allows moreunsaturated chemical bonds to be exposed on the surface of the glassmember, and the activation effect is better.

According to an embodiment of the prevent disclosure, the UV treatmentincludes UV irradiation of the surfaces of the first glass member andthe second glass member for 0.5-15 h (for example, 0.5 h, 0.6 h, 0.7 h,0.8 h, 0.9 h, 1.0 h, 1.1 h, 1.2 h, 1.3 h, 1.4 h, 1.5 h, 2 h, 3 h, 4 h, 5h, 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, 12 h, 13 h, 14 h, and 15 h); or UVirradiation, in the presence of ozone, of the surfaces of the firstglass member and the second glass member for 5-20 min (for example, 5min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min,15 min, 16 min, 17 min, 18 min, 19 min, and 20 min). As a result, moreunsaturated chemical bonds are generated and exposed on the surface ofthe glass member, and the activation effect is better.

According to an embodiment of the prevent disclosure, the plasmatreatment includes treating the surfaces of the first glass member andthe second glass member for 10-30 min (such as 10 min, 11 min, 12 min,13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, 20 min, 21 min,22 min, 23 min, 4 min, 25 min, 26 min, 27 min, 28 min, 29 min or 30 min)by at least one of O₂ plasma and N₂/H₂ plasma at an excitation frequencyof 10 MHz-15 MHz (such as 10.25 MHz, 10.5 MHz, 11 MHz, 11.25 MHz, 11.5MHz, 11.75 MHz, 12 MHz, 13 MHz, 13.8 MHz, 14 MHz, 14.5 MHz, and 15 MHz).As a result, more unsaturated chemical bonds are generated and exposedon the surface of the glass member, and the activation effect is better.

It should be noted that the phrase “N₂/H₂ plasma” used herein refers toa mixed plasma of N₂ and H₂. Specifically, the activation can beperformed by O₂ plasma alone, N₂/H₂ plasma alone, or O₂ plasma and N₂/H₂plasma in combination.

According to an embodiment of the prevent disclosure, the activation iscarried out at room temperature to 200° C. For example, the activationcan take place at 25° C., 40° C., 50° C., 60° C., 70° C., 80° C., 90°C., 100° C., 110° C., 130° C., 150° C., 170° C., 190° C., or 200° C. Inthis way, the activation in the above temperature range is moreconducive to the formation of more unsaturated chemical bonds, and theactivation effect is better. Compared with the above temperature range,if the activation temperature is too high, the activation solution iseasier to volatilize, so the service life is short, and the activationeffect is poor; and if the activation temperature is too low, theactivation effect of the glass is poor.

According to an embodiment of the prevent disclosure, since theunsaturated chemical bonds formed after the activation are extremelyactive and prone to reaction with oxygen in the air, and thus have ashort residence time, the first glass member and the second glass memberare positioned in a vacuum environment in a period of time from thecompletion of the activation to the completion of the contact. As aresult, the unsaturated chemical bonds formed after the activation willnot contact and react with oxygen in the air, thus extending theresidence time of the unsaturated chemical bonds. This is beneficial tothe subsequent steps, and improves the bonding strength between thefirst glass member and the second glass member. In some embodiments ofthe present disclosure, the activation can be directly performed in avacuum environment, or the first glass member and the second glassmember can also be positioned in a vacuum environment after theactivation, until the contact is completed. Therefore, the activity ofunsaturated chemical bonds are maintained as much as possible, therebysignificantly improving the bonding strength between the first glassmember and the second glass member.

According to an embodiment of the prevent disclosure, the activatedsurface obtained after the activation has a smaller contact angle withwater drops of, for example, not more than 10 degrees, such as 1 degree,2 degrees, 3 degrees, 4 degrees, 5 degrees, 6 degrees, 7 degrees, 8degrees, 9 degrees, or 10 degrees, etc. This shows that the activatedsurface is formed with more unsaturated chemical bonds having higherenergy, which facilitates the improvement of the bonding between thefirst glass member and the second glass member. According to anembodiment of the prevent disclosure, the surface roughness (RA) of thefirst glass member and the second glass member is not greater than 0.2μm, such as 0.2 μm, 0.18 μm, 0.16 μm, 0.15 μm, 0.12 μm, 0.1 μm, 0.08 μm,0.05 μm and so on. This further contributes to the improvement of thebonding strength between the first glass member and the second glassmember, thus improving the strength of the obtained glass composite. Insome other embodiments of the prevent disclosure, the surface roughnessof the first glass member and the second glass member is not greaterthan 0.2 μm, and the activated surface after the activation has acontact angle with water drops of not greater than 10 degrees. Thisfurther contributes to the improvement of the bonding strength betweenthe first glass member and the second glass member, thus improving thestrength of the obtained glass composite.

S200: Contact the activated surface of the first glass member with theactivated surface of the second glass member to form a glass composite.

According to an embodiment of the prevent disclosure, the contact causesthe unsaturated chemical bonds on the activated surface of the firstglass member to bond to the unsaturated chemical bonds on the activatedsurface of the second glass member to form a stable saturated chemicalbond. In this way, a new saturated chemical bond is formed at thecontact position, which not only improves the compounding strength ofthe first glass member and the second glass member, but also improvesthe inner unity of the glass composite, thereby improving the opticalperformance of the glass composite.

According to an embodiment of the prevent disclosure, when theaforementioned contact is made, the unsaturated chemical bonds arebonded on the compounding interface to form a new saturated chemicalbond. It should be noted that the compounding interface refers to acontact interface formed by contacting the activated surface of thefirst glass member with the activated surface of the second glassmember.

According to an embodiment of the prevent disclosure, the contact iscarried out in a vacuum environment. As a result, the unsaturatedchemical bonds formed after the activation will not contact and reactwith oxygen in the air, thus extending the residence time of theunsaturated chemical bonds. This is beneficial to the subsequent steps.It should be noted that the unsaturated chemical bonds formed after theactivation are extremely highly reactive and very likely to contact andreact with oxygen in the air, and thus have a short residence time. Ifthe contact is carried out in a vacuum environment, the reaction ofunsaturated chemical bonds after contact with air can be avoided, toallow the unsaturated chemical bonds to retain a high activity, therebyeffectively improving the bonding strength between the first glassmember and the second glass member.

According to an embodiment of the prevent disclosure, theabove-mentioned contact can be made with heating, and the first glassmember and the second glass member need to be heated. In someembodiments of the prevent disclosure, the heated area can be the sameas the area of the first glass member, or the same as the area of thesecond glass member. In some specific embodiments of the presentdisclosure, heating takes place at the position where the second glassmember and the first glass member are overlapped. As such, the firstglass member and the second glass member can be effectively heated andfixed together; and the heat utilization rate is high, the energyconsumption is reduced, and the influence of heating on other parts ofthe glass member is minimized.

According to an embodiment of the prevent disclosure, the contact takesplace at a first predetermined temperature, where the firstpredetermined temperature does not exceed the softening points of thefirst glass member and the second glass member. There is almost nosurface scald, distortion and unevenness caused by an excessively hightemperature, so that the final glass composite has an almost unaffectedlight transmittance, and an aesthetic appearance.

It should be noted that the softening point of glass member refers tothe temperature at which the glass member starts to soften, and theexpression “the first predetermined temperature does not exceed thesoftening points of the first glass member and the second glass member”used herein means that the first predetermined temperature does notexceed the lower one of the softening point of the first glass memberand the softening point of the second glass member.

In some embodiments of the prevent disclosure, the first predeterminedtemperature is between 200-900° C., such as 200° C., 250° C., 300° C.,350° C., 400° C., 450° C., 500° C., 550° C., 600° C., 650° C., 700° C.,750° C., 800° C., 850° C., and 900° C., etc. Therefore, the firstpredetermined temperature does not exceed the softening point of theglass members. Due to the low temperature, there is no scald on theouter surface of the glass, no softening of glass occurs, and nodeformation or unevenness occurs on the glass surface, whereby the lighttransmittance of the final glass composite is enhanced, and the glasscomposite has an aesthetic appearance. If the first predeterminedtemperature is too high, the glass member is easy to be softened, andscald, deformation, and unevenness may occur to the outer surface. A toohigh temperature is not conducive to the formation of new saturatedchemical bonds between the two glass members, affecting the opticalperformance of the glass composite. If the first predeterminedtemperature is too low, the bonding strength between the glass membersis low, such that the strength of the formed glass composite is low. Insome specific embodiments of the prevent disclosure, the firstpredetermined temperature is between 250-750° C., such as 200° C., 250°C., 300° C., 350° C., 400° C., 450° C., 500° C., 550° C., 600° C., 650°C., 700° C., and 750° C., etc. This is more conducive to the compoundingbetween the first glass member and the second glass member, and there isalmost no surface distortion and unevenness caused by an excessivelyhigh temperature. Therefore, the finally obtained glass composite has ahigher light transmittance and an aesthetic appearance.

According to an embodiment of the prevent disclosure, the contact iscarried out under pressure. It is more advantageous to compound thefirst glass member and the second glass member together under pressureto form a stronger glass composite, and there are almost no bubbles orfantasy colors in the glass composite. In some embodiments of theprevent disclosure, the pressure is 0.05-10 MPa, for example, 0.1 MPa,0.5 MPa, 0.8 MPa, 1.0 MPa, 1.2 MPa, 1.5 MPa, 1.8 MPa, 2.0 MPa, 3.0 MPa,5.0 MPa, 7.0 MPa, and 9.0 MPa. Therefore, the first glass member and thesecond glass member are more effectively bonded, and the strength of theglass composite is higher. If the pressure is too high, the glasssurface is prone to indentation, and the glass structure is easilydeformed. If the pressure is too low, the bonding force between theglass members is relatively low, and bubbles and fantasy colors arelikely to appear in the glass composite.

According to an embodiment of the prevent disclosure, during thepressurization process, pressurization occurs at the position where thesecond glass member and the first glass member are overlapped, wherebythe compounding strength between the first glass member and the secondglass member is ensured, and the pressurization process does not causeother parts of the first glass member and the second glass member tohave defects such as bending and deformation. Moreover, the pressurizedarea is small, which makes the pressure larger such that a largerbonding strength can be achieved under a lower pressure, and facilitatesthe reduction of bubbles and fantasy colors.

In some specific embodiments of the prevent disclosure, the glasscomposite can be prepared through a process comprising the followingsteps:

Step 1: cleaning a first glass member and a second glass member with adetergent to remove oil stain, and blow drying;

Step 2: activating the cleaned first glass member and second glassmember in an activation solution, heating from room temperature to 200°C. for a period of time, cooling naturally, washing off the residualsolution on the surface with pure water, and blow drying, to obtain thefirst glass member and the second glass member having activatedsurfaces, where the activation mainly aims to increase the unsaturatedchemical bonds on the surface of the glass members that are bonded toform a new stable saturated chemical bond when compounded, to promotethe subsequent compounding process; and

Step 3: contacting the activated surface of the first glass member withthe activated surface of the second glass member, heating to atemperature below the glass softening point, and applying a pressure atthe same time to compound at least part of the surfaces of the firstglass member and the second glass member to form a glass composite.

The present inventors find that the method is simple, convenient, andeasy to implement. After the activation, a new saturated chemical bondis formed between the first glass member and the second glass member.The bonding force is stronger, and the formed glass composite has highstrength and high inner unity. Moreover, the glass composite has arelatively flat surface, an aesthetic appearance, and an almostunaffected optical performance, and the light transmittance is high.

In another aspect of present disclosure, present disclosure provides acasing. According to an embodiment of the present disclosure, at least apart of the casing is formed by the glass composite as described above.As such, the bonding strength between the first glass member and thesecond glass member in the casing is high. The casing is ensured to haveexcellent structure stability, high light transmittance, good opticalperformance, and almost no bubbles or fantasy colors, and can attain aspecial-shaped structure, meet the requirements of use in differentsituations, and have a wide scope of application.

According to an embodiment of the present disclosure, the casing isformed by the glass composite described above. Specifically, there areno restrictions on the specific shape, connection mode, and connectionposition of the first glass member and the second glass member, andflexible selections can be made by those skilled in the art according tothe requirements during use. For example, they can be the same asdescribed for the glass products mentioned above, and will not berepeated here.

According to an embodiment of the prevent disclosure, referring to FIG.15, the frame-shaped glass member 20 and the sheet glass member 10 inthe casing can form a structure where the sheet glass member and theframe-shaped glass member connected is provided with an innerright-angled structure (a in FIG. 15); or where the sheet glass memberand the frame-shaped glass member connected is provided with an internalstep structure (b in FIG. 15); or the outer surface where the sheetglass member and the frame-shaped glass member connected is configuredto be a curved surface (c in FIG. 15); or the inner surface of theframe-shaped glass member is configured to be an outwardly bulged curvedsurface (fin FIG. 15); or the inner surface of the frame-shaped glassmember is con figured to be an inclined surface that gradually tiltsinwards (d in FIG. 15); or the frame-shaped glass member has an innersurface that is an inclined surface that gradually tilts outwards (e inFIG. 15); or the inner surface of the frame-shaped glass member isconfigured to be an inwardly bulged curved surface (g in FIG. 15).

According to an embodiment of the present disclosure, there are noparticular restrictions on the specific size of the casing, and flexibleselections can be made by those skilled in the art according to therequirements.

In another aspect of present disclosure, present disclosure provides adisplay device. According to an embodiment of the present disclosure,the display device includes the glass composite or the casing describedabove. Therefore, the display device has aesthetic appearance, highlight transmittance, good display effect, and high structure stability.

It is to be understood that the glass composite can be a protectivecover plate or a back casing of a display device, or can be a alkali ina color filter substrate or an array substrate, which can be selectedaccording to actual conditions.

According to an embodiment of the prevent disclosure, the type of thedisplay device is not particularly limited, and includes, for example,but is not limited to, a liquid crystal display device or an OLEDdisplay device. The display device may include, in addition to the glasscomposite, a structure that a conventional display device need to have,such as an array substrate, a color filter substrate, and an electrode,which will not be described here.

In another aspect of present disclosure, present disclosure provides aterminal device. According to an embodiment of the present disclosure,the terminal device includes the glass composite, the casing or thedisplay device described above. The present inventors find that theterminal device is aesthetically pleasant, has high strength, canachieve an all-glass appearance, and has good performance.

According to an embodiment of the prevent disclosure, the terminaldevice includes at least one of a mobile phone, a tablet computer, anotebook computer, a virtual reality (VR) device, an augmented reality(AR) device, a wearable device, and a game console. Therefore, the scopeof application is wide and can satisfy the consumers' consumptionexperience.

It should be noted that in addition to the display device, the terminaldevice may also include a structure that a conventional terminal deviceneeds to have, such as a CPU, a connecting circuit, and a packagingstructure, which are not described here.

The examples of the present disclosure are described in detail below.

Example Activation Examples Activation Example 1

60 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44 ml ofconcentrated sulfuric acid was slowly added. A first glass member and asecond glass member were soaked in the prepared mixed acid solution (for2 h at room temperature or for 30 min at 50° C.). The glass members wereremoved, and the residual chromium ions on the surfaces were washed offwith a 10% nitric acid solution. Then the glass members were washed withpure water for 10 min and then blow dried. In this way, the surfaces ofthe glass members were activated. The surface roughness of the glassmembers before activation was 0.612 nm.

Activation Example 2

20 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44 ml ofconcentrated sulfuric acid was slowly added. A first glass member and asecond glass member were soaked in the prepared mixed acid solution (for6 h at room temperature or for 150 min at 50° C.). The glass memberswere removed, and the residual chromium ions on the surfaces were washedoff with a 10% nitric acid solution. Then the glass members were washedwith pure water for 10 min and then blow dried. In this way, thesurfaces of the glass members were activated. The surface roughness ofthe glass members before activation was 0.592 nm.

Activation Example 3

30 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44 ml ofconcentrated sulfuric acid was slowly added. A first glass member and asecond glass member were soaked in the prepared mixed acid solution (for5 h at room temperature or for 120 min at 50° C.). The glass memberswere removed, and the residual chromium ions on the surfaces were washedoff with a 10% nitric acid solution. Then the glass members were washedwith pure water for 10 min and then blow dried. In this way, thesurfaces of the glass members were activated. The surface roughness ofthe glass members before activation was 0.589 nm.

Activation Example 4

40 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44 ml ofconcentrated sulfuric acid was slowly added. A first glass member and asecond glass member were soaked in the prepared mixed acid solution (for4 h at room temperature or for 90 min at 50° C.). The glass members wereremoved, and the residual chromium ions on the surfaces were washed offwith a 10% nitric acid solution. Then the glass members were washed withpure water for 10 min and then blow dried. In this way, the surfaces ofthe glass members were activated. The surface roughness of the glassmembers before activation was 0.659 nm.

Activation Example 5

50 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44 ml ofconcentrated sulfuric acid was slowly added. A first glass member and asecond glass member were soaked in the prepared mixed acid solution (for3 h at room temperature or for 60 min at 50° C.). The glass members wereremoved, and the residual chromium ions on the surfaces were washed offwith a 10% nitric acid solution. Then the glass members were washed withpure water for 10 min and then blow dried. In this way, the surfaces ofthe glass members were activated. The surface roughness of the glassmembers before activation was 0.192 nm.

Activation Example 6

A first glass member and a second glass member were soaked in a mixedsolution containing 10% hydrofluoric acid and 10% ammonium bifluoride atroom temperature for 30 min. Then, the glass members were washed withpure water at room temperature for 20 min and then dried. The surfaceroughness of the glass members before activation was 0.751 nm.

Activation Example 7

A first glass member and a second glass member were soaked in a mixedsolution containing 10% hydrofluoric acid and 10% ammonium bifluoride atroom temperature for 35 min. Then, the glass members were washed withpure water at room temperature for 20 min and then dried. The surfaceroughness of the glass members before activation was 0.526 nm.

Activation Example 8

A first glass member and a second glass member were soaked in a mixedsolution containing 5% hydrofluoric acid and 5% ammonium bifluoride atroom temperature for 40 min. Then, the glass members were washed withpure water at room temperature for 20 min and then dried. The surfaceroughness of the glass members before activation was 0.450 nm.

Activation Example 9

A first glass member and a second glass member were soaked in a mixedsolution containing 15% hydrofluoric acid and 15% ammonium bifluoride atroom temperature for 30 min. Then, the glass members were washed withpure water at room temperature for 20 min and then dried. The surfaceroughness of the glass members before activation was 0.654 nm.

Activation Example 10

The glass members were soaked in a mixed solution containing 20%hydrofluoric acid and 20% ammonium bifluoride at room temperature for 25min. Then, the glass members were washed with pure water at roomtemperature for 20 min and then dried. The surface roughness of theglass members before activation was 0.539 nm.

Activation Example 11

The glass members were soaked in a mixed solution containing 25%hydrofluoric acid and 25% ammonium bifluoride at room temperature for 20min. Then, the glass members were washed with pure water at roomtemperature for 20 min and then dried. The surface roughness of theglass members before activation was 0.238 nm.

Activation Example 12

The glass members were soaked in a mixed solution containing 30%hydrofluoric acid and 30% ammonium bifluoride at room temperature for 15min. Then, the glass members were washed with pure water at roomtemperature for 20 min and then dried. The surface roughness of theglass members before activation was 0.886 nm.

Activation Example 13

The glass members were soaked in a mixed solution containing 35%hydrofluoric acid and 35% ammonium bifluoride at room temperature for 10min. Then, the glass members were washed with pure water at roomtemperature for 20 min and then dried. The surface roughness of theglass members before activation was 0.556 nm.

Activation Example 14

The glass members were soaked in a mixed solution containing 40%hydrofluoric acid and 40% ammonium bifluoride at room temperature for 5min. Then, the glass members were washed with pure water at roomtemperature for 20 min and then dried. The surface roughness of theglass members before activation was 0.842 nm.

Activation Example 15

A first glass member and a second glass member were washed with a mixedsolution of hydrofluoric acid, sulfuric acid, and the surfactant sodiumdodecyl sulfonate, blow dried, then positioned in a mixed solution ofhydrogen peroxide and sulfuric acid (1:3), heated at 80° C. for 1 h, andcooled naturally. The residual solution on the surfaces was washed offwith pure water and then the glass members were blow dried. In this way,the surfaces of the glass members were activated. The surface roughnessof the glass members before activation was 0.610 nm.

Activation Example 16

A first glass member and a second glass member were washed with a mixedsolution of hydrofluoric acid, sulfuric acid, and the surfactant sodiumdodecyl sulfonate, blow dried, then positioned in a mixed solution ofhydrogen peroxide and sulfuric acid (1:2.8), heated at 80° C. for 1 h,and cooled naturally. The residual solution on the surfaces was washedoff with pure water and then the glass members were blow dried. In thisway, the surfaces of the glass members were activated. The surfaceroughness of the glass members before activation was 0.741 nm.

Activation Example 17

A first glass member and a second glass member were washed with a mixedsolution of hydrofluoric acid, sulfuric acid, and the surfactant sodiumdodecyl sulfonate, blow dried, then positioned in a mixed solution ofhydrogen peroxide and sulfuric acid (1:2.6), heated at 80° C. for 1 h,and cooled naturally. The residual solution on the surfaces was washedoff with pure water and then the glass members were blow dried. In thisway, the surfaces of the glass members were activated. The surfaceroughness of the glass members before activation was 0.843 nm.

Activation Example 18

A first glass member and a second glass member were washed with a mixedsolution of hydrofluoric acid, sulfuric acid, and the surfactant sodiumdodecyl sulfonate, blow dried, then positioned in a mixed solution ofhydrogen peroxide and sulfuric acid (1:2.5), heated at 80° C. for 1 h,and cooled naturally. The residual solution on the surfaces was washedoff with pure water and then the glass members were blow dried. In thisway, the surfaces of the glass members were activated. The surfaceroughness of the glass members before activation was 0.431 nm.

Activation Example 19

A first glass member and a second glass member were washed with a mixedsolution of hydrofluoric acid, sulfuric acid, and the surfactant sodiumdodecyl sulfonate, blow dried, then positioned in a mixed solution ofhydrogen peroxide and sulfuric acid (1:2.3), heated at 80° C. for 1 h,and cooled naturally. The residual solution on the surfaces was washedoff with pure water and then the glass members were blow dried. In thisway, the surfaces of the glass members were activated. The surfaceroughness of the glass members before activation was 0.607 nm.

Activation Example 20

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. 60 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44ml of concentrated sulfuric acid was slowly added. A first glass memberand a second glass member were soaked in the prepared mixed acidsolution (for 2 h at room temperature or for 30 min at 50° C.). Theglass members were removed, and the residual chromium ions on thesurfaces were washed off with a 10% nitric acid solution. Then the glassmembers were washed with pure water for 10 min and then blow dried. Inthis way, the surfaces of the glass members were activated.

Activation Example 21

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. 20 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44ml of concentrated sulfuric acid was slowly added. A first glass memberand a second glass member were soaked in the prepared mixed acidsolution (for 6 h at room temperature or for 150 min at 50° C.). Theglass members were removed, and the residual chromium ions on thesurfaces were washed off with a 10% nitric acid solution. Then the glassmembers were washed with pure water for 10 min and then blow dried. Inthis way, the surfaces of the glass members were activated.

Activation Example 22

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. 30 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44ml of concentrated sulfuric acid was slowly added. A first glass memberand a second glass member were soaked in the prepared mixed acidsolution (for 5 h at room temperature or for 120 min at 50° C.). Theglass members were removed, and the residual chromium ions on thesurfaces were washed off with a 10% nitric acid solution. Then the glassmembers were washed with pure water for 10 min and then blow dried. Inthis way, the surfaces of the glass members were activated.

Activation Example 23

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. 40 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44ml of concentrated sulfuric acid was slowly added. A first glass memberand a second glass member were soaked in the prepared mixed acidsolution (for 4 h at room temperature or for 90 min at 50° C.). Theglass members were removed, and the residual chromium ions on thesurfaces were washed off with a 10% nitric acid solution. Then the glassmembers were washed with pure water for 10 min and then blow dried. Inthis way, the surfaces of the glass members were activated.

Activation Example 24

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. 50 g of K₂Cr₂O₇ was dissolved in 270 g of water, and 44ml of concentrated sulfuric acid was slowly added. A first glass memberand a second glass member were soaked in the prepared mixed acidsolution (for 3 h at room temperature or for 60 min at 50° C.). Theglass members were removed, and the residual chromium ions on thesurfaces were washed off with a 10% nitric acid solution. Then the glassmembers were washed with pure water for 10 min and then blow dried. Inthis way, the surfaces of the glass members were activated.

Activation Example 25

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. A first glass member and a second glass member weresoaked in a mixed solution containing 10% hydrofluoric acid and 10%ammonium bifluoride at room temperature for 30 min. Then, the glassmembers were washed with pure water at room temperature for 20 min andthen dried.

Activation Example 26

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. A first glass member and a second glass member weresoaked in a mixed solution containing 10% hydrofluoric acid and 10%ammonium bifluoride at room temperature for 35 min. Then, the glassmembers were washed with pure water at room temperature for 20 min andthen dried.

Activation Example 27

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. A first glass member and a second glass member weresoaked in a mixed solution containing 5% hydrofluoric acid and 5%ammonium bifluoride at room temperature for 40 min. Then, the glassmembers were washed with pure water at room temperature for 20 min andthen dried.

Activation Example 28

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. A first glass member and a second glass member weresoaked in a mixed solution containing 15% hydrofluoric acid and 15%ammonium bifluoride at room temperature for 30 min. Then, the glassmembers were washed with pure water at room temperature for 20 min andthen dried.

Activation Example 29

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. A first glass member and a second glass member weresoaked in a mixed solution containing 20% hydrofluoric acid and 20%ammonium bifluoride at room temperature for 25 min. Then, the glassmembers were washed with pure water at room temperature for 20 min andthen dried.

Activation Example 30

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. A first glass member and a second glass member weresoaked in a mixed solution containing 25% hydrofluoric acid and 25%ammonium bifluoride at room temperature for 20 min. Then, the glassmembers were washed with pure water at room temperature for 20 min andthen dried.

Activation Example 31

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. A first glass member and a second glass member weresoaked in a mixed solution containing 30% hydrofluoric acid and 30%ammonium bifluoride at room temperature for 15 min. Then, the glassmembers were washed with pure water at room temperature for 20 min andthen dried.

Activation Example 32

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. A first glass member and a second glass member weresoaked in a mixed solution containing 35% hydrofluoric acid and 35%ammonium bifluoride at room temperature for 10 min. Then, the glassmembers were washed with pure water at room temperature for 20 min andthen dried.

Activation Example 33

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. A first glass member and a second glass member weresoaked in a mixed solution containing 40% hydrofluoric acid and 40%ammonium bifluoride at room temperature for 5 min. Then, the glassmembers were washed with pure water at room temperature for 20 min andthen dried.

Detection Means after Activation

The first glass members and second glass members obtained in all theabove activation examples were determined for the contact angle withwater drops. Specifically, water was dropped on the activated surface ofclean first glass member and second glass member. If the water dropletscan expand and wet the surface and the water droplets are visuallyobserved to be round and evenly infiltrate the surface, or the contactangle of water with the glass is determined by a contact angle tester tobe less than or equal to 10°, then the glass surface is considered to beclean and activated. The test results show that the contact angle (i.e.contact angle with water drops) of the activated surfaces of the firstglass member and the second glass member obtained in all the activationexamples is less than or equal to 10°. Specifically, the activatedsurfaces in Activation Examples 1-33 have respectively a contact angleof 3°, 2°, 3°, 3°, 2°, 3°, 2°, 2°, 3°, 3°, 3°, 2°, 3°, 2°, 2°, 3°, 1°,3°, 2°, 3°, 2°, 2°, 3°, 1°, 3°, 4°, 2°, 3°, 1°, 4°, 2°, 2°, and 3°.

Compounding Example 1

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member (sheet glass member)and the second glass member (rectangular frame-shaped glass member) wasas follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 15. The surface-activatedfirst glass member and second glass member were put into a vacuum box ora vacuum bag and evacuated (that is, coupling). The second glass memberwas positioned to the outer peripheral edge of the first glass member bya positioning fixture, CCD or other positioning methods, during whichcaution was taken to avoid foreign objects or fingers touching theactivated surfaces, to avoid contamination of the activated surfacecausing defects. After coupling, the glass members were heated to 650°C. and a pressure of 0.4 MPa was applied. The temperature and pressurewere maintained for 3 hours, and then the glass members were slowlycooled. In this way, the first glass member and the second glass memberwere compounded together, and a casing was obtained (see FIG. 4A for theschematic structure).

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member (see FIG. 17). Thebonding strength was tested. The test sample is schematically shown inFIG. 1 (where the length L of the glass member 1 and 2 is 24 mm, thewidth W1 is 12 mm, and the length L1 of the overlapping area of the twoglass members is 6 mm). The test method is schematically shown in FIG.16. Specifically, the sample was stretched at a speed of 5 mm/min by auniversal material testing machine until the glass was broken. Testresults: When the tensile force is 150 N (i.e., the bonding strength is2.08 MPa), there is no change at the bonding position, but the firstglass member and the second glass member are broken, indicating that thetwo pieces of glass are compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces are observed visually by naked eyes orunder a microscope at a magnification of 500× (see FIG. 18). Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of10% for 5 min. The compounding interface of the first glass member andthe second glass member was corroded. A crevice having a width of about10 μm was visually observed.

Comparative Example 1

The casing was prepared according to the method of Compounding Example1, except that the first glass member and the second glass member werenot activated. The casing obtained is observed to have obvious fantasycolors and large bubbles (see FIG. 19). The bonding strength was testedby the method of Compounding Example 1. The bonding strength is 10 N.The casing was cut along a direction vertical to the compoundinginterface. Compounding crevices exist at positions on the compoundinginterface where bubbles and fantasy colors are present (see FIG. 20). Bya steel ball of 32 g falling from a height of 1 meter, the casing wasbroken, and the glass partially cracked at positions on the compoundinginterface, indicating that the compounding effect is poor. Thisindicates that the bonding strength at positions where the bubbles andfantasy colors are present is poor, and the casing is easily broken.This indicates that the bonding strength at positions where the bubblesand fantasy colors are present is poor, and the casing is easily broken.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. Crevices are observed visually, indicating that thecompounding effect is poor.

Comparative Example 2

The casing was prepared according to the method of Compounding Example1, except that no activation was performed, and the first glass memberand the second glass member were coupled and heated to a temperatureabove the softening point of the first glass member and the second glassmember. The casing is observed to have obvious indentations andimpressions at the compounding interface, the deformation is serious,the visible light transmittance (in the band of 380-720 nm) is onlyabout 85%, and the local transmittance is less than or equal to 75%,causing a serious impact on the optical performance. The bondingstrength was tested by the test method of Compounding Example 1. Thebonding strength is consistent with that in Compounding Example 1. Bythis method, a similar compounding effect is obtained, which, however,cannot meet the appearance requirement.

Compounding Example 2

In this example, the first glass member and the second glass member areboth made of Corning GG5 glass with a thickness of 1 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member (sheet glass member)and the second glass member (circular frame-shaped glass member) is asfollows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 1. The surface-activatedfirst glass member and second glass member were coupled and heated to750° C., and then a pressure of 2 MPa was applied. The temperature andpressure were maintained for 5 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together, and a casing was obtained (see FIG. 4B for theschematic structure).

In the example, the obtained casing has a light transmittance of 91% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The test resultshows that when the tensile force is 155 N (that is, 2.15 MPa), there isno change at the bonding position, but the first glass member and thesecond glass member are broken, indicating that the two pieces of glassare compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 10% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 1-10 μm was visuallyobserved.

Comparative Example 3

The glass composite was prepared according to the method of CompoundingExample 2, except that the first glass member and the second glassmember were not activated. The casing obtained is observed to haveobvious fantasy colors and large bubbles. The bonding strength wastested by the method of Compounding Example 2. The bonding strength is20 N, indicating that the casing has poor bonding strength and tends tobreak at the positions where bubbles and fantasy colors are present.

Comparative Example 4

The glass composite was prepared according to the method of CompoundingExample 2, except that no activation was performed, and the first glassmember and the second glass member were coupled and heated to atemperature above the softening point of the first glass member and thesecond glass member. The casing is observed to have obvious indentationsand impressions at the compounding interface, the deformation isserious, and the light transmittance is only 85% or less for visiblelight (wavelength band 380-720 nm), causing a serious impact on theoptical performance. The bonding strength was tested by the test methodof Compounding Example 2. The bonding strength is consistent with thatin Compounding Example 2. By this method, a similar compounding effectis obtained, which, however, cannot meet the appearance requirement.

Compounding Example 3

In this example, the first glass member and the second glass member areboth made of Schott glass with a thickness of 3 mm (having a visiblelight transmittance of 91%-95%).

The method for compounding the first glass member (sheet glass member)and the second glass member (bar-shaped glass member) is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 2. The surface-activatedfirst glass member and second glass member were coupled and heated to700° C., and a pressure of 1 MPa was applied. The temperature andpressure were maintained for 4 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together, and a casing was obtained (see FIG. 4C for theschematic structure).

In the example, the obtained casing has a light transmittance of 91% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The test resultshows that when the tensile force is 160 N (that is, 2 at. 22 MPa),there is no change at the bonding position, but the first glass memberand the second glass member are broken, indicating that the two piecesof glass are compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 0.5-2 μm was visuallyobserved.

Comparative Example 5

The glass composite was prepared according to the method of CompoundingExample 3, except that the first glass member and the second glassmember were not activated. The casing obtained is observed to haveobvious fantasy colors and large bubbles. The bonding strength wastested by the method of Compounding Example 3. The bonding strength is15 N, indicating that the casing has poor bonding strength and tends tobreak at the positions where bubbles and fantasy colors are present.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. Crevices are observed at positions where fantasy colors andbubbles are present, indicating that the compounding effect is poor.

Comparative Example 6

The glass composite was prepared according to the method of CompoundingExample 3, except that no activation was performed, and the first glassmember and the second glass member were coupled and heated to atemperature above the softening point of the first glass member and thesecond glass member. The casing is observed to have obvious indentationsand impressions at the compounding interface, the deformation isserious. The bonding strength was tested by the test method ofCompounding Example 3. The bonding strength is consistent with that inCompounding Example 3. By this method, a similar compounding effect isobtained, which, however, cannot meet the appearance requirement.

Compounding Example 4

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%). The first glass member is of acurved glass shape, and the second glass member is of a curved glassshape. The surface of the first glass member is an upwardly bulgedcurved surface, and the surface of the second glass member is anupwardly depressed curved surface. The surfaces of the portions at whichthe two glass members need to be compounded have the same radius ofcurvature, and continuous contact can be achieved without crevices.

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 15. The surface-activatedfirst glass member and second glass member were put into a vacuum box ora vacuum bag and evacuated (that is, coupling). The second glass memberwas positioned to the outer peripheral edge of the first glass member bya positioning fixture, CCD or other positioning methods, during whichcaution was taken to avoid foreign objects or fingers touching theactivated surfaces, to avoid contamination of the activated surfacecausing defects. After coupling, the glass members were heated to 650°C. and a pressure of 0.4 MPa was applied. The temperature and pressurewere maintained for 3 hours, and then the glass members were slowlycooled. In this way, the first glass member and the second glass memberwere compounded together, and a casing was obtained.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The test resultshows that when the tensile force is 150 N (that is, the bondingstrength is 2.08 MPa), there is no change at the bonding position, butthe first glass member and the second glass member are broken,indicating that the two pieces of glass are compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 10% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 10-50 μm was visuallyobserved.

Compounding Example 5

The process was the same as that in Compounding Example 1, except thatthe first glass member and the second glass member were treated by themethod as described in Activation Example 20.

The obtained casing has a light transmittance of 93% or more for visiblelight (wavelength band 380-720 nm), which shows that the opticalperformance is better, and the performance during use is better. Theouter surfaces of the first glass member and the second glass member arevisually observed to be flat and smooth, and there are no obviousbubbles or fantasy colors at the compounding position of the first glassmember and the second glass member. The bonding strength was testedaccording to the method in Compounding Example 1. The test result showsthat when the tensile force is 164 N (that is, 2.28 MPa), there is nochange at the bonding position, but the first glass member and thesecond glass member are broken, indicating that the two pieces of glassare compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 10% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 10-50 μm was visuallyobserved.

Activation Example 34

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 1 h in a mixed solution of aqueous ammonia and hydrogenperoxide (1:1) at 40° C. The residual solution on the surface was washedoff for 10 min with pure water. Then the glass members were blow dried.In this way, the surfaces of the glass members were activated. Thesurface roughness of the glass members before activation was 0.543 nm.

Activation Example 35

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 50 min in a mixed solution of aqueous ammonia andhydrogen peroxide (1:2) at 40° C. The residual solution on the surfacewas washed off for 10 min with pure water. Then the glass members wereblow dried. In this way, the surfaces of the glass members wereactivated. The surface roughness of the glass members before activationwas 0.285 nm.

Activation Example 36

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 40 min in a mixed solution of aqueous ammonia andhydrogen peroxide (1:3) at 40° C. The residual solution on the surfacewas washed off for 10 min with pure water. Then the glass members wereblow dried. In this way, the surfaces of the glass members wereactivated. The surface roughness of the glass members before activationwas 0.369 nm.

Activation Example 37

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 30 min in a mixed solution of aqueous ammonia andhydrogen peroxide (1:4) at 40° C. The residual solution on the surfacewas washed off for 10 min with pure water. Then the glass members wereblow dried. In this way, the surfaces of the glass members wereactivated. The surface roughness of the glass members before activationwas 0.745 nm.

Activation Example 38

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 20 min in a mixed solution of aqueous ammonia andhydrogen peroxide (1:5) at 40° C. The residual solution on the surfacewas washed off for 10 min with pure water. Then the glass members wereblow dried. In this way, the surfaces of the glass members wereactivated. The surface roughness of the glass members before activationwas 0.943 nm.

Activation Example 39

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 30 min in a mixed solution of sodium hypochlorite andaqueous ammonia (containing, in percentage by weight, 5% of sodiumhypochlorite, 15% of aqueous ammonia, and 80% of deionized water) atroom temperature. The residual solution on the surface was washed offfor 10 min with pure water. Then the glass members were blow dried. Inthis way, the surfaces of the glass members were activated.

Activation Example 40

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 20 min in a mixed solution of sodium hypochlorite andaqueous ammonia (containing, in percentage by weight, 10% of sodiumhypochlorite, 30% of aqueous ammonia, and 60% of deionized water) atroom temperature. The residual solution on the surface was washed offfor 10 min with pure water. Then the glass members were blow dried. Inthis way, the surfaces of the glass members were activated.

Activation Example 41

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 60 min in a mixed solution of sodium hypochlorite andaqueous ammonia (containing, in percentage by weight, 5% of sodiumhypochlorite, 5% of aqueous ammonia, and 90% of deionized water) at roomtemperature. The residual solution on the surface was washed off for 10min with pure water. Then the glass members were blow dried. In thisway, the surfaces of the glass members were activated.

Activation Example 42

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 15 min in a mixed solution of sodium hypochlorite andaqueous ammonia (containing, in percentage by weight, 20% of sodiumhypochlorite, 30% of aqueous ammonia, and 50% of deionized water) atroom temperature. The residual solution on the surface was washed offfor 10 min with pure water. Then the glass members were blow dried. Inthis way, the surfaces of the glass members were activated.

Detection Means after Activation

The first glass members and second glass members obtained in all theabove activation examples were determined for the contact angle withwater drops. Specifically, water was dropped on the surface of cleanfirst glass member and second glass member. If the water droplets canexpand and wet the surface and the water droplets are visually observedto be round and evenly infiltrate the surface, or the contact angle ofwater with the glass is determined by a contact angle tester to be lessthan or equal to 10°, then the glass surface is considered to be cleanand activated. The test results show that the contact angle (i.e.contact angle with water drops) of the first glass member and the secondglass member obtained in Activation Examples 34-42 is less than or equalto 10°, and specifically 3°, 3°, 1°, 2°, 2°, 3°, 2°, 3°, and 1°.

Compounding Example 6

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member (sheet glass member)and the second glass member (rectangular frame-shaped glass member) wasas follows.

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 50 min in a mixed solution of aqueous ammonia andhydrogen peroxide (1:2) at 40° C. The residual solution on the surfacewas washed off for 10 min with pure water. Then the glass members wereblow dried. In this way, the surfaces of the glass members wereactivated. The surface-activated first glass member and second glassmember were brought into contact and heated to 700° C., and a pressureof 0.5 MPa was applied. The temperature and pressure were maintained for2 hours. In this way, the glass members were partially or totallycompounded together, and a casing was obtained, see FIG. 4A for theschematic structure.

In the example, the obtained casing has a light transmittance of 92% forvisible light (wavelength band 380-720 nm), which shows that the opticalperformance is better, and the performance during use is better. Thecasing surface is flat and smooth, and there are no visible bubbles,impurity spots, fantasy colors, and other defects at the compoundingposition. The casing was cut along a direction vertical to thecompounding surface, and no compounding crevice is observed at thecompounding interface. The bonding strength was tested by the method ofCompounding Example 1. The results show that the bonding strength is 151N (i.e. 2.1 MPa), there is no change at the bonding position, and theglass members are broken, indicating that the two pieces of glass arecompounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicates that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 10% for 5 min.The first glass member and the second glass were visually observed tohave crevices having a width of 10-50 μm.

Compounding Example 7

In this example, the first glass member and the second glass member areboth made of Schott glass (having a visible light transmittance of91%-93%).

The method for compounding the first glass member (sheet glass member)and the second glass member (circular frame-shaped glass member) is asfollows.

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 40 min in a mixed solution of aqueous ammonia andhydrogen peroxide (1:3) at 40° C. The residual solution on the surfacewas washed off for 10 min with pure water. Then the glass members wereblow dried. In this way, the surfaces of the glass members wereactivated. The surface-activated first glass member and second glassmember were brought into contact and heated to 610° C., and a pressureof 1 MPa was applied. The temperature and pressure were maintained for 2hours, and then the glass members were slowly cooled. In this way, theglass members were partially or totally compounded together, and acasing was obtained (see FIG. 4B for the schematic structure).

In the example, the obtained casing has a light transmittance of 91% forvisible light, which shows that the optical performance is better, andthe performance during use is better. The compounding position of thefirst glass member and the second glass member has no obvious bubblesand fantasy colors.

The bonding strength was tested according to the test method inCompounding Example 1. The test result shows that when the tensile forceis 159 N (that is, 2.21 MPa), there is no change at the bondingposition, but the first glass member or the second glass member isbroken, indicating that the two pieces of glass are compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicates that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 40% for 2 min.It is visually observed that obvious crevices are formed at thecompounding interface in the cross section.

Compounding Example 8

In this example, the first glass member and the second glass member areboth made of Schott glass (having a visible light transmittance of91%-93%).

The method for compounding the first glass member (sheet glass member)and the second glass member (bar-shaped glass member) is as follows.

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 60 min in a mixed solution of sodium hypochlorite andaqueous ammonia (containing, in percentage by weight, 10% of sodiumhypochlorite, 30% of aqueous ammonia, and 60% of deionized water) atroom temperature. The residual solution on the surface was washed offfor 10 min with pure water. Then the glass members were blow dried. Inthis way, the surfaces of the glass members were activated. Thesurface-activated first glass member and second glass member werebrought into contact and heated to 450° C., and a pressure of 1.5 MPawas applied. The temperature and pressure were maintained for 5 hours.Then, the glass members were slowly cooled. In this way, the glassmembers were partially or totally compounded together, and a casing wasobtained, see FIG. 4C for the schematic structure.

In the example, the obtained casing has a light transmittance of 91.5%for visible light (wavelength band 380-720 nm), which shows that theoptical performance is better, and the performance during use is better.The outer surfaces of the first glass member and the second glass memberare visually observed to be flat and smooth, and the compoundingposition of the first glass member and the second glass member has noobvious bubbles and fantasy colors.

The bonding strength was tested according to the test method inCompounding Example 1. The test result shows that when the tensile forceis 155 N (that is, 2.15 MPa), there is no change at the bondingposition, but the first glass member or the second glass member isbroken, indicating that the two pieces of glass are compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicates that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 20% for 5 min.It is visually observed that obvious crevices having a width of 0.5-20μm are formed at the compounding interface in the cross section.

Compounding Example 9

In this example, the first glass member and the second glass member areboth made of Schott glass (having a visible light transmittance of91%-93%). The first glass member is of a curved glass shape, and thesecond glass member is of a curved glass shape. The surface of the firstglass member is an upwardly bulged curved surface, and the surface ofthe second glass member is an upwardly depressed curved surface. Thesurfaces of the portions at which the two glass members need to becompounded have the same radius of curvature, and continuous contact canbe achieved without crevices.

The method for compounding the first glass member and the second glassmember is as follows.

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere treated for 40 min in a mixed solution of sodium hypochlorite andaqueous ammonia (containing, in percentage by weight, 20% of sodiumhypochlorite, 30% of aqueous ammonia, and 50% of deionized water) atroom temperature. The residual solution on the surface was washed offfor 10 min with pure water. Then the glass members were blow dried. Inthis way, the surfaces of the glass members were activated. Thesurface-activated first glass member and second glass member werebrought into contact and heated to 250° C., and a pressure of 2.0 MPawas applied. The temperature and pressure were maintained for 6 hours.Then, the glass members were slowly cooled. In this way, the glassmembers were partially or totally compounded together.

In the example, the obtained casing has a light transmittance of morethan 92.5% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the first glass member and the secondglass member are observed to be flat and smooth, and there are noobvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The bondingstrength is 130 N, there is no change at the compounding position, butthe glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicates that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 15% for 5 min.It is visually observed that obvious crevices are formed at thecompounding interface in the cross section.

Compounding Example 10

In this example, the first glass member and the second glass member areboth made of Schott glass (having a visible light transmittance of91%-93%). The first glass member is of a curved glass shape, and thesecond glass member is of a curved glass shape. The surface of the firstglass member is an upwardly bulged curved surface, and the surface ofthe second glass member is an upwardly depressed curved surface. Thesurfaces of the portions at which the two glass members need to becompounded have the same radius of curvature, and continuous contact canbe achieved without crevices.

The method for compounding the first glass member and the second glassmember is as follows.

First, the organic pollutant was removed from the first glass member andsecond glass member by an organic solvent, and then the impurities onthe surfaces were removed by using an alkaline detergent with a pH of14. The first glass member and second glass member were activated for 30min by immersing in a solution containing, in percentage by weight, 20%of sodium hypochlorite, 30% of aqueous ammonia, and 50% of deionizedwater at 30° C.

The surface-activated first glass member and second glass member werebrought into contact and heated to 750° C., and a pressure of 0.05 MPawas applied. The temperature and pressure were maintained for 3 hours.Then, the glass members were slowly cooled. In this way, the glassmembers were partially or totally compounded together.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the first glass member and the secondglass member are observed to be flat and smooth, and there are noobvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The bondingstrength is 135 N, there is no change at the bonding position, but theglass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 30% for 3.5 min.The compounding interface of the first glass member and the second glassmember was evenly corroded at a rate that is higher than the corrosionrate of the first glass member and the second glass member. It isvisually observed that crevices are formed at the compounding interfacein the cross section.

Compounding Example 11

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%). The first glass member is of acurved glass shape, and the second glass member is of a curved glassshape. The surface of the first glass member is an upwardly bulgedcurved surface, and the surface of the second glass member is anupwardly depressed curved surface. The surfaces of the portions at whichthe two glass members need to be compounded have the same radius ofcurvature, and continuous contact can be achieved without crevices.

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 34. The surface-activatedfirst glass member and second glass member were brought into contact andheated to 550° C., and a pressure of 1.0 MPa was applied. Thetemperature and pressure were maintained for 3 hours, and then the glassmembers were slowly cooled. In this way, the glass members werepartially or totally compounded together.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The bondingstrength is 130 N, there is no change at the bonding position, but theglass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 20 min.The compounding interface of the first glass member and the second glassmember was corroded. Crevices were visually observed.

Activation Example 43

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the first glass member and second glass member were irradiated withultraviolet light for 0.5 h to obtain glass members with clean andactivated surfaces.

Activation Example 44

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the first glass member and second glass member were irradiated withultraviolet light for 0.8 h to obtain glass members with clean andactivated surfaces.

Activation Example 45

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the first glass member and second glass member were irradiated withultraviolet light for 1 h to obtain glass members with clean andactivated surfaces.

Activation Example 46

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the first glass member and second glass member were irradiated withultraviolet light for 1.2 h to obtain glass members with clean andactivated surfaces. The surface roughness of the glass members beforeactivation was 0.203 nm.

Activation Example 47

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the first glass member and second glass member were irradiated withultraviolet light for 1.5 h to obtain glass members with clean andactivated surfaces.

Activation Example 48

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the cleaned glass members were positioned in an ozone-generatingdevice and irradiated with ultraviolet light for 5 min. This is becauseozone provides highly reactive atomic oxygen, which can form a volatilesubstance with free radicals generated after the dissociation of thedirt and thus enable an activated surface.

Activation Example 49

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the cleaned glass members were positioned in an ozone-generatingdevice and irradiated with ultraviolet light for 8 min.

Activation Example 50

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the cleaned glass members were positioned in an ozone-generatingdevice and irradiated with ultraviolet light for 10 min.

Activation Example 51

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the cleaned glass members were positioned in an ozone-generatingdevice and irradiated with ultraviolet light for 15 min.

Activation Example 52

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the cleaned glass members were positioned in an ozone-generatingdevice and irradiated with ultraviolet light for 20 min.

Activation Example 53

The oil stains on the surfaces were removed by washing the first glassmember and second glass member with trichloroethylene for 20 min, andthen the first glass member and second glass member were irradiated withultraviolet light for 12 h to obtain glass members with clean andactivated surfaces.

Detection Means after Activation

The first glass members and second glass members obtained in all theabove activation examples were determined for the contact angle withwater drops. Specifically, water was dropped on the activated surface ofclean first glass member and second glass member. If the water dropletscan expand and wet the surface and the water droplets are visuallyobserved to be round and evenly infiltrate the surface, or the contactangle of water with the glass is determined by a contact angle tester tobe less than or equal to 10°, then the glass surface is considered to beclean and activated. The test results show that the contact angle (i.e.contact angle with water drops) of the activated surfaces of the firstglass member and the second glass member obtained in all the activationexamples is less than or equal to 10°. Specifically, the activatedsurfaces in Activation Examples 43-53 have respectively a contact angleof 4°, 2°, 3°, 3°, 3°, 4°, 2°, 3°, 2°, 3°, and 3°.

Compounding Example 12

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member (sheet glass member)and the second glass member (rectangular frame-shaped glass member) wasas follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 43. The surface-activatedfirst glass member and second glass member were put into a vacuum box ora vacuum bag and evacuated, to contact the lower surface of the firstglass member with the upper surface of the second glass member. Thesecond glass member was positioned to the outer peripheral edge of thefirst glass member by a positioning fixture, CCD or other positioningmethods, during which caution was taken to avoid foreign objects orfingers touching the activated surfaces, to avoid contamination of theactivated surface causing defects. The glass members were heated to 650°C. and a pressure of 0.3 MPa was applied. The temperature and pressurewere maintained for 3 hours, and then the glass members were slowlycooled. In this way, the first glass member and the second glass memberwere compounded together, and a casing was obtained, see FIG. 4A for theschematic structure.

In the example, the obtained casing has a light transmittance of morethan 90% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member (see FIG. 9). The bondingstrength was tested according to the method in Compounding Example 1.The test result shows that when the tensile force is 151 N (that is, 2.1MPa), there is no change at the bonding position, but the first glassmember and the second glass member are broken, indicating that the twopieces of glass are compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 10% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 10-50 μm was visuallyobserved.

Compounding Example 13

In this example, the first glass member and the second glass member areboth made of Corning GG5 glass with a thickness of 1 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member (sheet glass member)and the second glass member (circular ring-shaped glass member) is asfollows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 44. The surface-activatedfirst glass member and second glass member were brought into contact atthe activated surfaces and heated to 700° C., and a pressure of 1 MPawas applied. The temperature and pressure were maintained for 3 hours,and then the glass members were slowly cooled. In this way, the glassmembers were partially or totally compounded together, and a casing wasobtained, see FIG. 4B for the schematic structure.

In the example, the obtained casing has a light transmittance of 90% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The test resultshows that when the tensile force is 156 N (that is, 2.16 MPa), there isno change at the bonding position, but the first glass member and thesecond glass member are broken, indicating that the two pieces of glassare compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 10% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 1-20 μm was visuallyobserved.

Compounding Example 14

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 3 mm (having avisible light transmittance of 91%-95%).

The method for compounding the first glass member (sheet glass member)and the second glass member (bar-shaped glass member) is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 43. The surface-activatedfirst glass member and second glass member were brought into contact atthe activated surfaces and heated to 750° C., and a pressure of 2 MPawas applied. The temperature and pressure were maintained for 4 hours,and then the glass members were slowly cooled. In this way, the glassmembers were partially or totally compounded together, and a casing wasobtained, see FIG. 4C for the schematic structure.

In the example, the obtained casing has a light transmittance of 90% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The test resultshows that when the tensile force is 161 N (that is, 2.23 MPa), there isno change at the bonding position, but the first glass member and thesecond glass member are broken, indicating that the two pieces of glassare compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 0.1-30 μm was visuallyobserved.

Compounding Example 15

In this example, the first glass member and the second glass member areboth made of Schott glass with a thickness of 3 mm (having a visiblelight transmittance of 91%-95%). The first glass member is of a flatglass shape, and the second glass member is of a curved glass shape. Themethod for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 46. The surface-activatedfirst glass member and second glass member were brought into contact atthe activated surfaces and heated to 750° C., and then a pressure of 2MPa was applied. The temperature and pressure were maintained for 4hours, and then the glass members were slowly cooled. In this way, theglass members were partially or totally compounded together.

In the example, the obtained casing has a light transmittance of 90% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The test resultshows that when the tensile force is 161 N (that is, 2.23 MPa), there isno change at the bonding position, but the first glass member and thesecond glass member are broken, indicating that the two pieces of glassare compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 0.2-2 μm was visuallyobserved.

Compounding Example 16

In this example, the first glass member and the second glass member areboth made of Schott glass with a thickness of 3 mm (having a visiblelight transmittance of 91%-95%). The first glass member is of a curvedglass shape, and the second glass member is of a flat glass shape. Themethod for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 47. The surface-activatedfirst glass member and second glass member were brought into contact atthe activated surfaces and heated to 750° C., and then a pressure of 2MPa was applied. The temperature and pressure were maintained for 4hours, and then the glass members were slowly cooled. In this way, theglass members were partially or totally compounded together.

In the example, the obtained casing has a light transmittance of 90% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The test resultshows that when the tensile force is 161 N (that is, 2.23 MPa), there isno change at the bonding position, but the first glass member and thesecond glass member are broken, indicating that the two pieces of glassare compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 0.2-2 μm was visuallyobserved.

Compounding Example 17

In this example, the first glass member and the second glass member areboth made of Schott glass with a thickness of 3 mm (having a visiblelight transmittance of 91%-95%). The first glass member is of a curvedglass shape, and the second glass member is of a curved glass shape. Thesurface of the first glass member is an upwardly bulged curved surface,and the surface of the second glass member is an upwardly depressedcurved surface. The surfaces of the portions at which the two glassmembers need to be compounded have the same radius of curvature, andcontinuous contact can be achieved without crevices. The method forcompounding the first glass member and the second glass member is asfollows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 48. The surface-activatedfirst glass member and second glass member were brought into contact atthe activated surfaces and heated to 750° C., and then a pressure of 2MPa was applied. The temperature and pressure were maintained for 4hours, and then the glass members were slowly cooled. In this way, theglass members were partially or totally compounded together.

In the example, the obtained casing has a light transmittance of 90% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested. The test sample is schematically shown in FIG. 1 (where thelength L of the glass member 1 and 2 is 24 mm, the width W1 is 12 mm,and the length L1 of the overlapping area of the two glass members is 6mm). The test method is schematically shown in FIG. 16. Specifically,the sample was stretched at a speed of 5 mm/min by a universal materialtesting machine until the glass was broken.

Test results: When the tensile force is 161 N (i.e., 2.23 MPa), there isno change at the bonding position, but the first glass member and thesecond glass member are broken, indicating that the two pieces of glassare compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 0.2-2 μm was visuallyobserved.

Compounding Example 18

In this example, the first glass member and the second glass member areboth made of Schott glass with a thickness of 3 mm (having a visiblelight transmittance of 91%-95%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 49. The surface-activatedfirst glass member and second glass member were brought into contact atthe activated surfaces and heated to 750° C., and then a pressure of 2MPa was applied. The temperature and pressure were maintained for 4hours, and then the glass members were slowly cooled. In this way, theglass members were partially or totally compounded together.

In the example, the obtained casing has a light transmittance of 90% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in Compounding Example 1. The test resultshows that when the tensile force is 161 N (that is, 2.23 MPa), there isno change at the bonding position, but the first glass member and thesecond glass member are broken, indicating that the two pieces of glassare compounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 0.2-2 μm was visuallyobserved.

Compounding Example 19

In this example, the first glass member and the second glass member areboth made of Schott glass with a thickness of 3 mm (having a visiblelight transmittance of 91%-95%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 50. The surface-activatedfirst glass member and second glass member were brought into contact atthe activated surfaces and heated to 750° C., and then a pressure of 2MPa was applied. The temperature and pressure were maintained for 4hours, and then the glass members were slowly cooled. In this way, theglass members were partially or totally compounded together.

In the example, the obtained casing has a light transmittance of 90% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in the compounding examples. The testresult shows that when the tensile force is 161 N, there is no change atthe bonding position, but the first glass member and the second glassmember are broken, indicating that the two pieces of glass arecompounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 0.2-2 μm was visuallyobserved.

Compounding Example 20

In this example, the first glass member and the second glass member areboth made of Schott glass with a thickness of 3 mm (having a visiblelight transmittance of 91%-95%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 51. The surface-activatedfirst glass member and second glass member were brought into contact atthe activated surfaces and heated to 750° C., and then a pressure of 2MPa was applied. The temperature and pressure were maintained for 4hours, and then the glass members were slowly cooled. In this way, theglass members were partially or totally compounded together.

In the example, the obtained casing has a light transmittance of 90% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in the compounding examples. The testresult shows that when the tensile force is 161 N, there is no change atthe bonding position, but the first glass member and the second glassmember are broken, indicating that the two pieces of glass arecompounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 0.2-2 μm was visuallyobserved.

Compounding Example 21

In this example, the first glass member and the second glass member areboth made of Schott glass with a thickness of 3 mm (having a visiblelight transmittance of 91%-95%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 52. The surface-activatedfirst glass member and second glass member were brought into contact atthe activated surfaces and heated to 750° C., and then a pressure of 2MPa was applied. The temperature and pressure were maintained for 4hours, and then the glass members were slowly cooled. In this way, theglass members were partially or totally compounded together.

In the example, the obtained casing has a light transmittance of 90% ormore for visible light (wavelength band 380-720 nm), which shows thatthe optical performance is better, and the performance during use isbetter. The outer surfaces of the first glass member and the secondglass member are visually observed to be flat and smooth, and there areno obvious bubbles or fantasy colors at the compounding position of thefirst glass member and the second glass member. The bonding strength wastested according to the method in the compounding examples. The testresult shows that when the tensile force is 161 N, there is no change atthe bonding position, but the first glass member and the second glassmember are broken, indicating that the two pieces of glass arecompounded into one.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 5% for 5 min.The compounding interface of the first glass member and the second glassmember was corroded. A crevice having a width of 0.2-2 μm was visuallyobserved.

Activation Example 54

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere positioned in a plasma dry cleaner, and washed with 02 plasma for10 min at an excitation frequency of 13.56 MHz, to remove the organicson the surfaces and activate the surfaces.

Activation Example 55

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere positioned in a plasma dry cleaner, and washed with N₂/H₂ plasmafor 10 min at an excitation frequency of 13.56 MHz, to remove theorganics on the surfaces and activate the surfaces.

Activation Example 56

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere positioned in a plasma dry cleaner, washed with 02 plasma for 5 minat an excitation frequency of 13.56 MHz to remove the organics on thesurfaces, and washed with N2/H2 plasma for 5 min, to remove the oxideson the surfaces and activate the surfaces.

Activation Example 57

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere positioned in a plasma dry cleaner, washed with 02 plasma for 10min at an excitation frequency of 13.56 MHz to remove the organics onthe surfaces, and washed with N2/H2 plasma for 5 min, to remove theoxides on the surfaces and activate the surfaces.

Activation Example 58

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere positioned in a plasma dry cleaner, washed with 02 plasma for 5 minat an excitation frequency of 13.56 MHz to remove the organics on thesurfaces, and washed with N2/H2 plasma for 10 min, to remove the oxideson the surfaces and activate the surfaces.

Activation Example 59

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere positioned in a plasma dry cleaner, washed with 02 plasma for 10min at an excitation frequency of 13.56 MHz to remove the organics onthe surfaces, and washed with N2/H2 plasma for 10 min, to remove theoxides on the surfaces and activate the surfaces. The surface roughnessof the glass members before activation was 0.512 nm.

Activation Example 60

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere positioned in a plasma dry cleaner, washed with 02 plasma for 10min at an excitation frequency of 13.56 MHz to remove the organics onthe surfaces, and washed with N2/H2 plasma for 15 min, to remove theoxides on the surfaces and activate the surfaces.

Activation Example 61

At room temperature, a first glass member and a second glass member wererespectively washed in acetone, a peracetic acid solution or a calciumhypochlorite solution in sequence for 30 min, removed, washed with purewater and dried. The washed first glass member and second glass memberwere positioned in a plasma dry cleaner, washed with 02 plasma for 15min at an excitation frequency of 13.56 MHz to remove the organics onthe surfaces, and washed with N₂/H₂ plasma for 15 min, to remove theoxides on the surfaces and activate the surfaces.

Detection Means after Activation

The first glass members and second glass members obtained in all theabove activation examples were determined for the contact angle withwater drops. Specifically, water was dropped on the activated surface ofclean first glass member and second glass member. If the water dropletscan expand and wet the surface and the water droplets are visuallyobserved to be round and evenly infiltrate the surface, or the contactangle of water with the glass is determined by a contact angle tester tobe less than or equal to 10°, then the glass surface is considered to beclean and activated. The test results show that the contact angle (i.e.contact angle with water drops) of the activated surfaces of the firstglass member and the second glass member obtained in all the activationexamples is less than or equal to 10°. Specifically, the activatedsurfaces in Activation Examples 54-61 have respectively a contact angleof 7°, 5°, 4°, 4°, 3°, 2°, 3°, and 2°.

Compounding Example 22

In this example, the sheet glass member (first glass member) and theframe-shaped glass member (second glass member) are both made of Schottglass (having a visible light transmittance of 91%-93%).

The method for compounding the sheet glass member and the frame-shapedglass member is as follows.

The sheet glass member and the frame-shaped glass member were activatedfollowing the method in Activation Example 59. The surface-activatedsheet glass member and frame-shaped glass member were put into a vacuumbox or a vacuum bag and evacuated (that is, coupling). The frame-shapedglass member was positioned to the outer peripheral edge of the sheetglass member by a positioning fixture, CCD or other positioning methods,during which caution was taken to avoid foreign objects or fingerstouching the activated surfaces, to avoid contamination of the activatedsurface causing defects. After coupling, the glass members were heatedto 600° C. and a pressure of 0.84 MPa was applied. The temperature andpressure were maintained for 2 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together, and a casing was obtained, see FIG. 4A for theschematic structure.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and noobvious bubbles or fantasy colors are visually observed at thecompounding position of the sheet glass member and the frame-shapedglass member (see FIG. 9). The bonding strength was tested according tothe method in Compounding Example 1. The result shows that the bondingstrength is 140 N (that is, 1.94 MPa), there is no change at the bondingposition, but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces or crevices were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of40% for 2 min. It is visually observed that obvious crevices having awidth of about 10 μm are formed at the compounding interface in thecross section.

Compounding Example 23

In this example, the sheet glass member (first glass member) and theframe-shaped glass member (second glass member) are both made of CorningGG3 glass (having a visible light transmittance of 91%-93%).

The method for compounding the sheet glass member and the frame-shapedglass member is as follows.

The sheet glass member and the frame-shaped glass member were activatedfollowing the method in Activation Example 59. The surface-activatedsheet glass member and frame-shaped glass member were coupled, heated to450° C. and a pressure of 1.0 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together, and a casing was obtained, see FIG. 4A for theschematic structure.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the frame-shaped glass member. The bondingstrength was tested according to the method in Compounding Example 1.The bonding strength is 135 N (that is, 1.88 MPa), there is no change atthe bonding position, but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicates that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 20% for 5 min.It is visually observed that obvious crevices having a width of about 5μm are formed at the compounding interface in the cross section.

Compounding Example 24

In this example, the sheet glass member (first glass member) and theframe-shaped glass member (second glass member) are both made of Schottglass (having a visible light transmittance of 91%-93%).

The method for compounding the sheet glass member and the frame-shapedglass member is as follows.

The sheet glass member and the frame-shaped glass member were activatedfollowing the method in Activation Example 59. The surface-activatedsheet glass member and circular frame-shaped glass member were coupledand heated to 250° C., and a pressure of 2.0 MPa was applied. Thetemperature and pressure were maintained for 3 hours, and then the glassmembers were slowly cooled. In this way, the glass members werepartially or totally compounded together, and a casing was obtained (seeFIG. 4B for the schematic structure).

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the frame-shaped glass member. The bondingstrength was tested according to the method in Compounding Example 1.The bonding strength is 130 N (that is, 1.8 MPa), there is no change atthe bonding position, but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicates that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 15% for 5 min.It is visually observed that obvious crevices having a width of about 3μm are formed at the compounding interface in the cross section.

Compounding Example 25

In this example, the sheet glass member (first glass member) and thebar-shaped glass member (second glass member) are both made of Schottglass (having a visible light transmittance of 91%-93%).

The method for compounding the sheet glass member and the frame-shapedglass member is as follows.

The sheet glass member and the bar-shaped glass member were activatedfollowing the method in Activation Example 59. The surface-activatedsheet glass member and bar-shaped glass member were coupled, heated to750° C. and a pressure of 0.05 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together, and a casing was obtained, see FIG. 4C for theschematic structure.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and thebar-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the bar-shaped glass member. The bondingstrength was tested according to the method in Compounding Example 1.The bonding strength is 135 N, there is no change at the bondingposition, but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the bar-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces were observed visually by naked eyes orunder a microscope at a magnification of 500×. This indicated that thecompounding effect is good. The cross section was corroded in ahydrofluoric acid solution with a mass concentration of 30% for 3.5 min.The compounding interface of the sheet glass member and the bar-shapedglass member was evenly corroded at a rate that is higher than thecorrosion rate of the sheet glass member and the bar-shaped glassmember. It is visually observed that crevices having a width of about 15μm are formed at the compounding interface in the cross section.

Compounding Example 26

The process was the same as that in Compounding Example 22, except thatthe sheet glass member (first glass member) and the frame-shaped glassmember (second glass member) were activated by the method as describedin Activation Example 54.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the frame-shaped glass member. The bondingstrength was tested. The test result shows that the bonding strength is129 N (that is, 1.8 MPa), there is no change at the bonding position,but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces or crevices were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of30% for 3 min. It is visually observed that obvious crevices are formedat the compounding interface in the cross section.

Compounding Example 27

The process was the same as that in Compounding Example 22, except thatthe sheet glass member (first glass member) and the frame-shaped glassmember (second glass member) were activated by the method as describedin Activation Example 55.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the frame-shaped glass member. The bondingstrength was tested. The results show that the bonding strength is 131 N(that is, 1.82 MPa), there is no change at the bonding position, but theglass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces or crevices were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of20% for 4 min. It is visually observed that obvious crevices are formedat the compounding interface in the cross section.

Compounding Example 28

The process was the same as that in Compounding Example 22, except thatthe sheet glass member (first glass member) and the frame-shaped glassmember (second glass member) were activated by the method as describedin Activation Example 56.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the frame-shaped glass member. The bondingstrength was tested. The test results show that the bonding strength is145 N (that is, 2.0 MPa), there is no change at the bonding position,but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces or crevices were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of15% for 7 min. It is visually observed that obvious crevices are formedat the compounding interface in the cross section.

Compounding Example 29

The process was the same as that in Compounding Example 22, except thatthe sheet glass member (first glass member) and the frame-shaped glassmember (second glass member) were activated by the method as describedin Activation Example 57.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the frame-shaped glass member. The bondingstrength was tested. The test results show that the bonding strength is148 N (that is, 2.05 MPa), there is no change at the bonding position,but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces or crevices were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of25% for 8 min. It is visually observed that obvious crevices are formedat the compounding interface in the cross section.

Compounding Example 30

The process was the same as that in Compounding Example 22, except thatthe sheet glass member (first glass member) and the frame-shaped glassmember (second glass member) were activated by the method as describedin Activation Example 58.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the frame-shaped glass member. The bondingstrength was tested. The test results show that the bonding strength is149 N (that is, 2.06 MPa), there is no change at the bonding position,but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces or crevices were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of35% for 5 min. It is visually observed that obvious crevices are formedat the compounding interface in the cross section.

Compounding Example 31

The process was the same as that in Compounding Example 22, except thatthe sheet glass member (first glass member) and the frame-shaped glassmember (second glass member) were activated by the method as describedin Activation Example 60.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the frame-shaped glass member. The bondingstrength was tested. The test results show that the bonding strength is150 N (that is, 2.08 MPa), there is no change at the bonding position,but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces or crevices were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of10% for 10 min. It is visually observed that obvious crevices are formedat the compounding interface in the cross section.

Compounding Example 32

The process was the same as that in Compounding Example 22, except thatthe sheet glass member (first glass member) and the frame-shaped glassmember (second glass member) were activated by the method as describedin Activation Example 61.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the sheet glass member and theframe-shaped glass member are observed to be flat and smooth, and thereare no obvious bubbles or fantasy colors at the compounding position ofthe sheet glass member and the frame-shaped glass member. The bondingstrength was tested. The test results show that the bonding strength is151 N (that is, 2.10 MPa), there is no change at the bonding position,but the glass member is broken.

The casing obtained above was cut along the thickness direction at thebonding position where the sheet glass member and the frame-shaped glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces or crevices were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of 5%for 10 min. It is visually observed that obvious crevices are formed atthe compounding interface in the cross section.

Compounding Example 33

The process was the same as that in Compounding Example 22, except thatthe first glass member is of a curved glass shape, and the second glassmember is of a curved glass shape; the surface of the first glass memberis an upwardly bulged curved surface, and the surface of the secondglass member is an upwardly depressed curved surface; and the surfacesof the portions at which the two glass members need to be compoundedhave the same radius of curvature, and continuous contact can beachieved without crevices.

In the example, the obtained casing has a light transmittance of morethan 91% for visible light (wavelength band 380-720 nm), which showsthat the optical performance is better, and the performance during useis better. The outer surfaces of the first glass member and the secondglass member are observed to be smooth, and there are no obvious bubblesor fantasy colors at the compounding position of the first glass memberand the second glass member. The bonding strength was tested. The testresults show that the bonding strength is 140 N (that is, 1.94 MPa),there is no change at the bonding position, but the glass member isbroken.

The casing obtained above was cut along the thickness direction at thebonding position where the first glass member and the second glassmember were connected to form a cross section, and the cross section waspolished. No compounding traces or crevices were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of 5%for 10 min. It is visually observed that obvious crevices are formed atthe compounding interface in the cross section.

Compounding Example 34

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 34. The surface-activatedfirst glass member and second glass member were coupled and heated to550° C., and a pressure of 1.0 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together.

In the example, the obtained glass composite has a light transmittanceof more than 91% for visible light (wavelength band 380-720 nm), whichshows that the optical performance is better, and the performance duringuse is better. The outer surfaces of the first glass member and thesecond glass member are visually observed to be flat and smooth, andthere are no obvious bubbles or fantasy colors at the compoundingposition of the first glass member and the second glass member. Thebonding strength was tested according to the method in CompoundingExample 1. The test results show that when the tensile force is 160 N,there is no change at the bonding position, but the glass member isbroken.

The glass composite obtained above was cut along the thickness directionat the bonding position where the first glass member and the secondglass member were connected to form a cross section, and the crosssection was polished. No compounding traces were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicated that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of 5%for 10 min. The compounding interface of the first glass member and thesecond glass member was corroded. A crevice having a width of 10 μm wasvisually observed.

Compounding Example 35

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 50. The surface-activatedfirst glass member and second glass member were coupled and heated to600° C., and a pressure of 0.8 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together.

In the example, the obtained glass composite has a light transmittanceof more than 91% for visible light (wavelength band 380-720 nm), whichshows that the optical performance is better, and the performance duringuse is better. The outer surfaces of the first glass member and thesecond glass member are visually observed to be flat and smooth, andthere are no obvious bubbles or fantasy colors at the compoundingposition of the first glass member and the second glass member. Thebonding strength was tested according to the method in CompoundingExample 1. The test results show that when the tensile force is 162 N,there is no change at the bonding position, but the glass member isbroken.

The glass composite obtained above was cut along the thickness directionat the bonding position where the first glass member and the secondglass member were connected to form a cross section, and the crosssection was polished. No compounding traces are observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of10% for 5 min. The compounding interface of the first glass member andthe second glass member was corroded. A crevice having a width of about10 μm was visually observed.

Compounding Example 36

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 15. The surface-activatedfirst glass member and second glass member were coupled and heated to650° C., and a pressure of 0.7 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together.

In the example, the obtained glass composite has a light transmittanceof more than 91% for visible light (wavelength band 380-720 nm), whichshows that the optical performance is better, and the performance duringuse is better. The outer surfaces of the first glass member and thesecond glass member are visually observed to be flat and smooth, andthere are no obvious bubbles or fantasy colors at the compoundingposition of the first glass member and the second glass member. Thebonding strength was tested according to the method in CompoundingExample 1. The test results show that when the tensile force is 158 N,there is no change at the bonding position, but the glass member isbroken.

The glass composite obtained above was cut along the thickness directionat the bonding position where the first glass member and the secondglass member were connected to form a cross section, and the crosssection was polished. No compounding traces were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of 5%for 5 min. The compounding interface of the first glass member and thesecond glass member was corroded. A crevice having a width of 5 μm wasvisually observed.

Compounding Example 37

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 15. The surface-activatedfirst glass member and second glass member were coupled and heated to700° C., and a pressure of 0.3 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together.

In the example, the obtained glass composite has a light transmittanceof more than 91% for visible light (wavelength band 380-720 nm), whichshows that the optical performance is better, and the performance duringuse is better. The outer surfaces of the first glass member and thesecond glass member are visually observed to be flat and smooth, andthere are no obvious bubbles or fantasy colors at the compoundingposition of the first glass member and the second glass member. Thebonding strength was tested according to the method in CompoundingExample 1. The test results show that when the tensile force is 155 N,there is no change at the bonding position, but the glass member isbroken.

The glass composite obtained above was cut along the thickness directionat the bonding position where the first glass member and the secondglass member were connected to form a cross section, and the crosssection was polished. No compounding traces are observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of20% for 5 min. The compounding interface of the first glass member andthe second glass member was corroded. A crevice having a width of about20 μm was visually observed.

Compounding Example 38

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 15. The surface-activatedfirst glass member and second glass member were coupled and heated to750° C., and a pressure of 0.1 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together.

In the example, the obtained glass composite has a light transmittanceof more than 90% for visible light (wavelength band 380-720 nm), whichshows that the optical performance is better, and the performance duringuse is better. The outer surfaces of the first glass member and thesecond glass member are visually observed to be flat and smooth, andthere are no obvious bubbles or fantasy colors at the compoundingposition of the first glass member and the second glass member. Thebonding strength was tested according to the method in CompoundingExample 1. The test results show that when the tensile force is 156 N,there is no change at the bonding position, but the glass member isbroken.

The glass composite obtained above was cut along the thickness directionat the bonding position where the first glass member and the secondglass member were connected to form a cross section, and the crosssection was polished. No compounding traces are observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of40% for 5 min. The compounding interface of the first glass member andthe second glass member was corroded. A crevice having a width of about20 μm was visually observed.

Compounding Example 39

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 15. The surface-activatedfirst glass member and second glass member were coupled and heated to500° C., and a pressure of 1.2 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together.

In the example, the obtained glass composite has a light transmittanceof more than 91% for visible light (wavelength band 380-720 nm), whichshows that the optical performance is better, and the performance duringuse is better. The outer surfaces of the first glass member and thesecond glass member are visually observed to be flat and smooth, andthere are no obvious bubbles or fantasy colors at the compoundingposition of the first glass member and the second glass member. Thebonding strength was tested according to the method in CompoundingExample 1. The test results show that when the tensile force is 154 N,there is no change at the bonding position, but the glass member isbroken.

The glass composite obtained above was cut along the thickness directionat the bonding position where the first glass member and the secondglass member were connected to form a cross section, and the crosssection was polished. No compounding traces are observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of 5%for 10 min. The compounding interface of the first glass member and thesecond glass member was corroded. A crevice having a width of about 10μm was visually observed.

Compounding Example 40

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 15. The surface-activatedfirst glass member and second glass member were coupled and heated to550° C., and a pressure of 0.9 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together.

In the example, the obtained glass composite has a light transmittanceof more than 91% for visible light (wavelength band 380-720 nm), whichshows that the optical performance is better, and the performance duringuse is better. The outer surfaces of the first glass member and thesecond glass member are visually observed to be flat and smooth, andthere are no obvious bubbles or fantasy colors at the compoundingposition of the first glass member and the second glass member. Thebonding strength was tested according to the method in CompoundingExample 1. The test results show that when the tensile force is 146 N,there is no change at the bonding position, but the glass member isbroken.

The glass composite obtained above was cut along the thickness directionat the bonding position where the first glass member and the secondglass member were connected to form a cross section, and the crosssection was polished. No compounding traces are observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of10% for 10 min. The compounding interface of the first glass member andthe second glass member was corroded. A crevice having a width of about20 μm was visually observed.

Compounding Example 41

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 15. The surface-activatedfirst glass member and second glass member were coupled and heated to580° C., and a pressure of 0.95 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together.

In the example, the obtained glass composite has a light transmittanceof more than 91% for visible light (wavelength band 380-720 nm), whichshows that the optical performance is better, and the performance duringuse is better. The outer surfaces of the first glass member and thesecond glass member are visually observed to be flat and smooth, andthere are no obvious bubbles or fantasy colors at the compoundingposition of the first glass member and the second glass member. Thebonding strength was tested according to the method in CompoundingExample 1. The test results show that when the tensile force is 149 N,there is no change at the bonding position, but the glass member isbroken.

The glass composite obtained above was cut along the thickness directionat the bonding position where the first glass member and the secondglass member were connected to form a cross section, and the crosssection was polished. No compounding traces were observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicated that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of20% for 10 min. The compounding interface of the first glass member andthe second glass member was corroded. A crevice having a width of 40 μmwas visually observed.

Compounding Example 42

In this example, the first glass member and the second glass member areboth made of Corning GG3 glass with a thickness of 0.7 mm (having avisible light transmittance of 91%-93%).

The method for compounding the first glass member and the second glassmember is as follows.

The first glass member and the second glass member were activatedfollowing the method in Activation Example 15. The surface-activatedfirst glass member and second glass member were coupled and heated to600° C., and a pressure of 0.7 MPa was applied. The temperature andpressure were maintained for 3 hours, and then the glass members wereslowly cooled. In this way, the glass members were partially or totallycompounded together.

In the example, the obtained glass composite has a light transmittanceof more than 91% for visible light (wavelength band 380-720 nm), whichshows that the optical performance is better, and the performance duringuse is better. The outer surfaces of the first glass member and thesecond glass member are visually observed to be flat and smooth, andthere are no obvious bubbles or fantasy colors at the compoundingposition of the first glass member and the second glass member. Thebonding strength was tested according to the method in CompoundingExample 1. The test results show that when the tensile force is 148 N,there is no change at the bonding position, but the glass member isbroken.

The glass composite obtained above was cut along the thickness directionat the bonding position where the first glass member and the secondglass member were connected to form a cross section, and the crosssection was polished. No compounding traces are observed visually bynaked eyes or under a microscope at a magnification of 500×. Thisindicates that the compounding effect is good. The cross section wascorroded in a hydrofluoric acid solution with a mass concentration of40% for 10 min. The compounding interface of the first glass member andthe second glass member was corroded. A crevice having a width of about70 μm was visually observed.

In the description of the present disclosure, it can be understood that,terms “first” and “second” are used only for a purpose of description,and shall not be construed as indicating or implying relative importanceor implying a quantity of indicated technical features. Therefore, thefeatures defined by “first”, and “second” may explicitly or implicitlyinclude one or more features. In the description of the presentdisclosure, unless otherwise specifically limited, “a plurality of”means two or more than two.

In the description of the present specification, the description of thereference terms “an embodiment”, “some embodiments”, “specific example”,“some examples” or the like means that specific features, structures,materials or characteristics described in combination with theembodiment are included in at least one embodiment of the presentdisclosure. In the present specification, the illustrative expression ofthe above terms is not necessarily referring to the same embodiment orexample. Moreover, the described specific features, structures,materials or characteristics may be combined in any suitable manners inone or more embodiments. In addition, where there are no contradictions,the various embodiments or examples described in this specification andfeatures of various embodiments or examples can be combined by thoseskilled in the art.

Although the embodiments of the present disclosure have been shown anddescribed above, it can be understood that, the foregoing embodimentsare exemplary and should not be understood as limitation to the presentdisclosure. A person of ordinary skill in the art can make changes,modifications, replacements, or variations to the foregoing embodimentswithin the scope of the present disclosure.

1. A glass composite, comprising: a first glass member and a secondglass member, wherein: the first glass member and the second glassmember are at least partially connected with each other at the surfaces;and a contact interface is formed on the contacting position of thefirst glass member and the second glass member, wherein: the contactinterface is visually observed to have no crevices; and when the glasscomposite is in contact with an acid solution, crevices are suitablyformed in the glass composite at the contact interface.
 2. The glasscomposite according to claim 1, wherein: the glass composite is visuallyobserved to have no crevices at the contact interface under 100×magnification, or the glass composite is visually observed to have nocrevices at the contact interface under 300× magnification, or the glasscomposite is visually observed to have no crevices at the contactinterface under 500× magnification.
 3. The glass composite according toclaim 1, wherein: the acid solution is a hydrofluoric acid solution,wherein a mass concentration of the hydrofluoric acid solution is 5-40%.4. The glass composite according to claim 3, wherein after the glasscomposite is brought into contact with a hydrofluoric acid solution witha mass concentration of 5-40% for 30 s to 20 min, crevices with a widthof 0.1-300 μm are formed on the glass composite at the contactinterface.
 5. The glass composite according to claim 4, wherein theglass composite comprises at least one of: after contacting withhydrofluoric acid with a mass concentration of 5% for 300 s, thecrevices on the glass composite at the contact interface having a widthof 0.1-30 μm; after contacting with hydrofluoric acid with a massconcentration of 10% for 300 s, the crevices on the glass composite atthe contact interface having a width of 0.5-50 μm; after contacting withhydrofluoric acid with a mass concentration of 20% for 300 s, thecrevices on the glass composite at the contact interface having a widthof 0.5-100 μm; after contacting with hydrofluoric acid with a massconcentration of 40% for 300 s, the crevices on the glass composite atthe contact interface having a width of 2-100 μm; after contacting withhydrofluoric acid with a mass concentration of 5% for 600 s, thecrevices on the glass composite at the contact interface having a widthof 1-50 μm; after contacting with hydrofluoric acid with a massconcentration of 10% for 600 s, the crevices on the glass composite atthe contact interface having a width of 1-80 μm; after contacting withhydrofluoric acid with a mass concentration of 20% for 600 s, thecrevices on the glass composite at the contact interface having a widthof 3-120 μm; and after contacting with hydrofluoric acid with a massconcentration of 40% for 600 s, the crevices on the glass composite atthe contact interface having a width of 5-120 μm.
 6. The glass compositeaccording to claim 1, wherein the glass composite has a lighttransmittance equal to or higher than 95% of the light transmittance ofthe one, with the lower light transmittance, of the first glass memberand the second glass member.
 7. The glass composite according to claim1, wherein at least one surface of the first glass member or the secondglass member is provided with an anti-reflection film.
 8. The glasscomposite according to claim 1, wherein: at least one of the first glassmember and the second glass member is formed by a plurality of sub-glassmembers, and at least part of the surfaces of two adjacent sub-glassmembers are connected.
 9. The glass composite according to claim 1,wherein the glass composite is prepared through a process, the processcomprises: performing an activating treatment on at least a part of thesurface of the first glass member and at least a part of the surface ofthe second glass member, to form an activated surface; and making theactivated surface of the first glass member to contact with theactivated surface of the second glass member to form the glasscomposite, wherein the process further comprises: before the activation,cleaning the surface to be activated of the first glass member and thesurface to be activated of the second glass member.
 10. (canceled) 11.The glass composite according to claim 9, wherein the activationcomprises: producing unsaturated chemical bonds on the surface of thefirst glass member and the surface of the second glass member, whereinthe contacting suitably makes the unsaturated chemical bonds on theactivated surface of the first glass member and the unsaturated chemicalbonds on the activated surface of the second glass member to be bondedto form a saturated chemical bond.
 12. (canceled)
 13. The glasscomposite according to claim 9, wherein: the activation comprises atleast one of: making a treatment with an activation solution, theactivation solution being acid or alkaline; making a treatment with aplasma; and making a treatment with a UV; the pH of the activationsolution is not greater than 4, or the pH of the activation solution is10-14; and the activation solution comprises: an acid or an alkali; andan auxiliary agent, wherein the auxiliary agent comprising at least oneof an oxidizing agent, an alcohol, an organic acid, a carbohydrate, anamino acid, and a surfactant, wherein: the acid comprises at least oneof sulfuric acid, hydrochloric acid, hydrogen fluoride, ammoniumbifluoride, nitric acid and acetic acid; the alkali comprises at leastone of sodium carbonate, sodium bicarbonate, potassium hydroxide, sodiumhydroxide and aqueous ammonia; and the oxidizing agent comprises atleast one of potassium dichromate, potassium permanganate, hydrogenperoxide and nitric acid. 14-16. (canceled)
 17. The glass compositeaccording to claim 13, wherein the activation solution comprises atleast one of: a raw material of the activation solution, comprising:hydrogen peroxide and sulfuric acid, wherein the activation solutioncomprises a mixed solution of hydrogen peroxide and sulfuric acid in avolume ratio of (1:3)-(3:7); a raw material of the activation solution,comprising: potassium dichromate and sulfuric acid, wherein theactivation solution comprises a mixture of potassium dichromate andsulfuric acid in a mass ratio of (1-3):4; a raw material of theactivation solution, comprising: hydrofluoric acid and ammoniumbifluoride, wherein the hydrofluoric acid and ammonium bifluoride bothhaving a mass concentration of 5%-40% in the activation solution; a rawmaterial of the activation solution, comprising: aqueous ammonia andhydrogen peroxide, wherein the activation solution comprises a mixedsolution of aqueous ammonia and hydrogen peroxide in a volume ratio of(1:1)-(1:5); and a raw material of the activation solution, comprising:sodium hypochlorite and aqueous ammonia, wherein the activation solutioncomprises a mixture of 5-20 wt % of sodium hypochlorite, 5-30 wt % ofaqueous ammonia and 50-90 wt % of deionized water.
 18. The glasscomposite according to claim 13, wherein: the UV treatment comprises:the surfaces of the first glass member and the second glass member aredirectly irradiated for 0.5-15 h with ultraviolet light; or the surfacesof the first glass member and the second glass member are irradiated for5-20 min with ultraviolet light in the presence of ozone; and the plasmatreatment comprises: the surfaces of the first glass member and thesecond glass member are treated for 10-30 min by at least one of O₂plasma and N₂/H₂ plasma.
 19. The glass composite according to claim 9,wherein: the activated surface has a water contact angle equal to orless than 10 degrees; the surface roughness of at least one of the firstglass member and the second glass member is equal to or less than 0.2μm, and the activation is performed at room temperature to 200° C.20-21. (canceled)
 22. The glass composite according to claim 9, wherein:the first glass member and the second glass member are positioned in avacuum environment in a period of time from the completion of theactivation to the completion of the contact; the contact is performed ina first predetermined temperature condition, wherein the firstpredetermined temperature does not exceed the softening points of thefirst glass member and the second glass member, wherein: the firstpredetermined temperature is 200-900° C., or the first predeterminedtemperature is 250-750° C.; and the contact is performed under pressure,wherein the pressure is 0.05-10 MPa. 23-25. (canceled)
 26. A casing,wherein at least part of the casing is formed by a glass composite, theglass composite comprises: a first glass member and a second glassmember, wherein: the first glass member and the second glass member areat least partially connected with each other at the surfaces; and acontact interface is formed on the contacting position of the firstglass member and the second glass member, wherein: the contact interfaceis visually observed to have no crevices; and when the glass compositeis in contact with an acid solution, crevices are suitably formed in theglass composite at the contact interface.
 27. The casing according toclaim 26, wherein the first glass member is a sheet glass member, andthe second glass member is a frame-shaped glass member or a bar-shapedglass member, and wherein the lower surface of the frame-shaped glassmember or the bar-shaped glass member is compounded onto the outerperipheral edge of the sheet glass member; or the lower surface of theframe-shaped glass member or the bar-shaped glass member is compoundedonto the outer peripheral face of the sheet glass member.
 28. The casingaccording to claim 26, wherein: at least one of the outer surface andthe inner surface of the position where the first glass member and thesecond glass member are connected is a flat surface, a curved surface,or a combination of a flat surface and a curved surface.
 29. The casingaccording to claim 26, wherein: the casing comprises at least one of: aninner right-angled structure disposed at a location where the firstglass member and the second glass member is connected; or an internalstep structure disposed at the location where the first glass member andthe second glass member is connected; or an outer surface of thelocation where the first glass member and the second glass member isconnected, the outer surface being configured to be a curved surface; oran inner surface of the second glass member configured to be anoutwardly bulged curved surface; or an inner surface of the second glassmember configured to be an inclined surface that gradually tiltsinwards; or an inner surface of the second glass member configured to bean inclined surface that gradually tilts outwards; or an inner surfaceof the second glass member configured to be an inwardly bulged curvedsurface.
 30. A display device, comprising: a glass composite,comprising: a first glass member and a second glass member, wherein: thefirst glass member and the second glass member are at least partiallyconnected with each other at the surfaces; and a contact interface isformed on the contacting position of the first glass member and thesecond glass member, wherein: the contact interface is visually observedto have no crevices; and when the glass composite is in contact with anacid solution, crevices are suitably formed in the glass composite atthe contact interface; or a casing, wherein at least part of the casingis formed by a glass composite, the glass composite comprises: a firstglass member and a second glass member, wherein: the first glass memberand the second glass member are at least partially connected with eachother at the surfaces; and a contact interface is formed on thecontacting position of the first glass member and the second glassmember, wherein: the contact interface is visually observed to have nocrevices; and when the glass composite is in contact with an acidsolution, crevices are suitably formed in the glass composite at thecontact interface.
 31. (canceled)